Input: add driver for Cypress APA I2C Trackpad

This patch introduces a driver for Cypress All Points Addressable
I2C Trackpad, including the ones in 2012 Samsung Chromebooks.

This device is compatible with MT protocol type B, providing identifiable
contacts.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 804 insertions, 0 deletions

diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
new file mode 100644
index 000000000000..1a14688329be
--- /dev/null
+++ b/drivers/input/mouse/cyapa.c
@@ -0,0 +1,804 @@
+/*
+ * Cypress APA trackpad with I2C interface
+ *
+ * Author: Dudley Du <dudl@cypress.com>
+ * Further cleanup and restructuring by:
+ *   Daniel Kurtz <djkurtz@chromium.org>
+ *   Benson Leung <bleung@chromium.org>
+ *
+ * Copyright (C) 2011-2012 Cypress Semiconductor, Inc.
+ * Copyright (C) 2011-2012 Google, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+/* APA trackpad firmware generation */
+#define CYAPA_GEN3   0x03   /* support MT-protocol B with tracking ID. */
+
+#define CYAPA_NAME   "Cypress APA Trackpad (cyapa)"
+
+/* commands for read/write registers of Cypress trackpad */
+#define CYAPA_CMD_SOFT_RESET       0x00
+#define CYAPA_CMD_POWER_MODE       0x01
+#define CYAPA_CMD_DEV_STATUS       0x02
+#define CYAPA_CMD_GROUP_DATA       0x03
+#define CYAPA_CMD_GROUP_CMD        0x04
+#define CYAPA_CMD_GROUP_QUERY      0x05
+#define CYAPA_CMD_BL_STATUS        0x06
+#define CYAPA_CMD_BL_HEAD          0x07
+#define CYAPA_CMD_BL_CMD           0x08
+#define CYAPA_CMD_BL_DATA          0x09
+#define CYAPA_CMD_BL_ALL           0x0a
+#define CYAPA_CMD_BLK_PRODUCT_ID   0x0b
+#define CYAPA_CMD_BLK_HEAD         0x0c
+
+/* report data start reg offset address. */
+#define DATA_REG_START_OFFSET  0x0000
+
+#define BL_HEAD_OFFSET 0x00
+#define BL_DATA_OFFSET 0x10
+
+/*
+ * Operational Device Status Register
+ *
+ * bit 7: Valid interrupt source
+ * bit 6 - 4: Reserved
+ * bit 3 - 2: Power status
+ * bit 1 - 0: Device status
+ */
+#define REG_OP_STATUS     0x00
+#define OP_STATUS_SRC     0x80
+#define OP_STATUS_POWER   0x0c
+#define OP_STATUS_DEV     0x03
+#define OP_STATUS_MASK (OP_STATUS_SRC | OP_STATUS_POWER | OP_STATUS_DEV)
+
+/*
+ * Operational Finger Count/Button Flags Register
+ *
+ * bit 7 - 4: Number of touched finger
+ * bit 3: Valid data
+ * bit 2: Middle Physical Button
+ * bit 1: Right Physical Button
+ * bit 0: Left physical Button
+ */
+#define REG_OP_DATA1       0x01
+#define OP_DATA_VALID      0x08
+#define OP_DATA_MIDDLE_BTN 0x04
+#define OP_DATA_RIGHT_BTN  0x02
+#define OP_DATA_LEFT_BTN   0x01
+#define OP_DATA_BTN_MASK (OP_DATA_MIDDLE_BTN | OP_DATA_RIGHT_BTN | \
+                          OP_DATA_LEFT_BTN)
+
+/*
+ * Bootloader Status Register
+ *
+ * bit 7: Busy
+ * bit 6 - 5: Reserved
+ * bit 4: Bootloader running
+ * bit 3 - 1: Reserved
+ * bit 0: Checksum valid
+ */
+#define REG_BL_STATUS        0x01
+#define BL_STATUS_BUSY       0x80
+#define BL_STATUS_RUNNING    0x10
+#define BL_STATUS_DATA_VALID 0x08
+#define BL_STATUS_CSUM_VALID 0x01
+
+/*
+ * Bootloader Error Register
+ *
+ * bit 7: Invalid
+ * bit 6: Invalid security key
+ * bit 5: Bootloading
+ * bit 4: Command checksum
+ * bit 3: Flash protection error
+ * bit 2: Flash checksum error
+ * bit 1 - 0: Reserved
+ */
+#define REG_BL_ERROR         0x02
+#define BL_ERROR_INVALID     0x80
+#define BL_ERROR_INVALID_KEY 0x40
+#define BL_ERROR_BOOTLOADING 0x20
+#define BL_ERROR_CMD_CSUM    0x10
+#define BL_ERROR_FLASH_PROT  0x08
+#define BL_ERROR_FLASH_CSUM  0x04
+
+#define BL_STATUS_SIZE  3  /* length of bootloader status registers */
+#define BLK_HEAD_BYTES 32
+
+#define PRODUCT_ID_SIZE  16
+#define QUERY_DATA_SIZE  27
+#define REG_PROTOCOL_GEN_QUERY_OFFSET  20
+
+#define REG_OFFSET_DATA_BASE     0x0000
+#define REG_OFFSET_COMMAND_BASE  0x0028
+#define REG_OFFSET_QUERY_BASE    0x002a
+
+#define CAPABILITY_LEFT_BTN_MASK        (0x01 << 3)
+#define CAPABILITY_RIGHT_BTN_MASK       (0x01 << 4)
+#define CAPABILITY_MIDDLE_BTN_MASK      (0x01 << 5)
+#define CAPABILITY_BTN_MASK  (CAPABILITY_LEFT_BTN_MASK | \
+                              CAPABILITY_RIGHT_BTN_MASK | \
+                              CAPABILITY_MIDDLE_BTN_MASK)
+
+#define CYAPA_OFFSET_SOFT_RESET  REG_OFFSET_COMMAND_BASE
+
+#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)
+
+#define PWR_MODE_MASK   0xfc
+#define PWR_MODE_FULL_ACTIVE (0x3f << 2)
+#define PWR_MODE_IDLE        (0x05 << 2) /* default sleep time is 50 ms. */
+#define PWR_MODE_OFF         (0x00 << 2)
+
+#define PWR_STATUS_MASK      0x0c
+#define PWR_STATUS_ACTIVE    (0x03 << 2)
+#define PWR_STATUS_IDLE      (0x02 << 2)
+#define PWR_STATUS_OFF       (0x00 << 2)
+
+/*
+ * CYAPA trackpad device states.
+ * Used in register 0x00, bit1-0, DeviceStatus field.
+ * Other values indicate device is in an abnormal state and must be reset.
+ */
+#define CYAPA_DEV_NORMAL  0x03
+#define CYAPA_DEV_BUSY    0x01
+
+enum cyapa_state {
+        CYAPA_STATE_OP,
+        CYAPA_STATE_BL_IDLE,
+        CYAPA_STATE_BL_ACTIVE,
+        CYAPA_STATE_BL_BUSY,
+        CYAPA_STATE_NO_DEVICE,
+};
+
+
+struct cyapa_touch {
+        /*
+         * high bits or x/y position value
+         * bit 7 - 4: high 4 bits of x position value
+         * bit 3 - 0: high 4 bits of y position value
+         */
+        u8 xy_hi;
+        u8 x_lo;  /* low 8 bits of x position value. */
+        u8 y_lo;  /* low 8 bits of y position value. */
+        u8 pressure;
+        /* id range is 1 - 15.  It is incremented with every new touch. */
+        u8 id;
+} __packed;
+
+/* The touch.id is used as the MT slot id, thus max MT slot is 15 */
+#define CYAPA_MAX_MT_SLOTS  15
+
+struct cyapa_reg_data {
+        /*
+         * bit 0 - 1: device status
+         * bit 3 - 2: power mode
+         * bit 6 - 4: reserved
+         * bit 7: interrupt valid bit
+         */
+        u8 device_status;
+        /*
+         * bit 7 - 4: number of fingers currently touching pad
+         * bit 3: valid data check bit
+         * bit 2: middle mechanism button state if exists
+         * bit 1: right mechanism button state if exists
+         * bit 0: left mechanism button state if exists
+         */
+        u8 finger_btn;
+        /* CYAPA reports up to 5 touches per packet. */
+        struct cyapa_touch touches[5];
+} __packed;
+
+/* The main device structure */
+struct cyapa {
+        enum cyapa_state state;
+
+        struct i2c_client *client;
+        struct input_dev *input;
+        char phys[32];  /* device physical location */
+        int irq;
+        bool irq_wake;  /* irq wake is enabled */
+
+        /* read from query data region. */
+        char product_id[16];
+        u8 btn_capability;
+        u8 gen;
+        int max_abs_x;
+        int max_abs_y;
+        int physical_size_x;
+        int physical_size_y;
+};
+
+static const u8 bl_deactivate[] = { 0x00, 0xff, 0x3b, 0x00, 0x01, 0x02, 0x03,
+                0x04, 0x05, 0x06, 0x07 };
+static const u8 bl_exit[] = { 0x00, 0xff, 0xa5, 0x00, 0x01, 0x02, 0x03, 0x04,
+                0x05, 0x06, 0x07 };
+
+struct cyapa_cmd_len {
+        u8 cmd;
+        u8 len;
+};
+
+static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
+        { CYAPA_OFFSET_SOFT_RESET, 1 },
+        { REG_OFFSET_COMMAND_BASE + 1, 1 },
+        { REG_OFFSET_DATA_BASE, 1 },
+        { REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) },
+        { REG_OFFSET_COMMAND_BASE, 0 },
+        { REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE },
+        { BL_HEAD_OFFSET, 3 },
+        { BL_HEAD_OFFSET, 16 },
+        { BL_HEAD_OFFSET, 16 },
+        { BL_DATA_OFFSET, 16 },
+        { BL_HEAD_OFFSET, 32 },
+        { REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE },
+        { REG_OFFSET_DATA_BASE, 32 }
+};
+
+static ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
+                                        u8 *values)
+{
+        return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
+}
+
+static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
+                                         size_t len, const u8 *values)
+{
+        return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
+}
+
+static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
+{
+        u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
+
+        return i2c_smbus_read_byte_data(cyapa->client, cmd);
+}
+
+static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
+{
+        u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
+
+        return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
+}
+
+static ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
+{
+        u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
+        size_t len = cyapa_i2c_cmds[cmd_idx].len;
+
+        return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
+}
+
+/*
+ * Query device for its current operating state.
+ *
+ */
+static int cyapa_get_state(struct cyapa *cyapa)
+{
+        int ret;
+        u8 status[BL_STATUS_SIZE];
+
+        cyapa->state = CYAPA_STATE_NO_DEVICE;
+
+        /*
+         * Get trackpad status by reading 3 registers starting from 0.
+         * If the device is in the bootloader, this will be BL_HEAD.
+         * If the device is in operation mode, this will be the DATA regs.
+         *
+         */
+        ret = cyapa_i2c_reg_read_block(cyapa, BL_HEAD_OFFSET, BL_STATUS_SIZE,
+                                       status);
+        if (ret != BL_STATUS_SIZE)
+                goto error;
+
+        if ((status[REG_OP_STATUS] & OP_STATUS_SRC) == OP_STATUS_SRC) {
+                switch (status[REG_OP_STATUS] & OP_STATUS_DEV) {
+                case CYAPA_DEV_NORMAL:
+                case CYAPA_DEV_BUSY:
+                        cyapa->state = CYAPA_STATE_OP;
+                        break;
+                default:
+                        ret = -EAGAIN;
+                        goto error;
+                }
+        } else {
+                if (status[REG_BL_STATUS] & BL_STATUS_BUSY)
+                        cyapa->state = CYAPA_STATE_BL_BUSY;
+                else if (status[REG_BL_ERROR] & BL_ERROR_BOOTLOADING)
+                        cyapa->state = CYAPA_STATE_BL_ACTIVE;
+                else
+                        cyapa->state = CYAPA_STATE_BL_IDLE;
+        }
+
+        return 0;
+error:
+        return (ret < 0) ? ret : -EAGAIN;
+}
+
+/*
+ * Poll device for its status in a loop, waiting up to timeout for a response.
+ *
+ * When the device switches state, it usually takes ~300 ms.
+ * However, when running a new firmware image, the device must calibrate its
+ * sensors, which can take as long as 2 seconds.
+ *
+ * Note: The timeout has granularity of the polling rate, which is 100 ms.
+ *
+ * Returns:
+ *   0 when the device eventually responds with a valid non-busy state.
+ *   -ETIMEDOUT if device never responds (too many -EAGAIN)
+ *   < 0    other errors
+ */
+static int cyapa_poll_state(struct cyapa *cyapa, unsigned int timeout)
+{
+        int ret;
+        int tries = timeout / 100;
+
+        ret = cyapa_get_state(cyapa);
+        while ((ret || cyapa->state >= CYAPA_STATE_BL_BUSY) && tries--) {
+                msleep(100);
+                ret = cyapa_get_state(cyapa);
+        }
+        return (ret == -EAGAIN || ret == -ETIMEDOUT) ? -ETIMEDOUT : ret;
+}
+
+static int cyapa_bl_deactivate(struct cyapa *cyapa)
+{
+        int ret;
+
+        ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_deactivate),
+                                        bl_deactivate);
+        if (ret < 0)
+                return ret;
+
+        /* wait for bootloader to switch to idle state; should take < 100ms */
+        msleep(100);
+        ret = cyapa_poll_state(cyapa, 500);
+        if (ret < 0)
+                return ret;
+        if (cyapa->state != CYAPA_STATE_BL_IDLE)
+                return -EAGAIN;
+        return 0;
+}
+
+/*
+ * Exit bootloader
+ *
+ * Send bl_exit command, then wait 50 - 100 ms to let device transition to
+ * operational mode.  If this is the first time the device's firmware is
+ * running, it can take up to 2 seconds to calibrate its sensors.  So, poll
+ * the device's new state for up to 2 seconds.
+ *
+ * Returns:
+ *   -EIO    failure while reading from device
+ *   -EAGAIN device is stuck in bootloader, b/c it has invalid firmware
+ *   0       device is supported and in operational mode
+ */
+static int cyapa_bl_exit(struct cyapa *cyapa)
+{
+        int ret;
+
+        ret = cyapa_i2c_reg_write_block(cyapa, 0, sizeof(bl_exit), bl_exit);
+        if (ret < 0)
+                return ret;
+
+        /*
+         * Wait for bootloader to exit, and operation mode to start.
+         * Normally, this takes at least 50 ms.
+         */
+        usleep_range(50000, 100000);
+        /*
+         * In addition, when a device boots for the first time after being
+         * updated to new firmware, it must first calibrate its sensors, which
+         * can take up to an additional 2 seconds.
+         */
+        ret = cyapa_poll_state(cyapa, 2000);
+        if (ret < 0)
+                return ret;
+        if (cyapa->state != CYAPA_STATE_OP)
+                return -EAGAIN;
+
+        return 0;
+}
+
+/*
+ * Set device power mode
+ *
+ */
+static int cyapa_set_power_mode(struct cyapa *cyapa, u8 power_mode)
+{
+        struct device *dev = &cyapa->client->dev;
+        int ret;
+        u8 power;
+
+        if (cyapa->state != CYAPA_STATE_OP)
+                return 0;
+
+        ret = cyapa_read_byte(cyapa, CYAPA_CMD_POWER_MODE);
+        if (ret < 0)
+                return ret;
+
+        power = ret & ~PWR_MODE_MASK;
+        power |= power_mode & PWR_MODE_MASK;
+        ret = cyapa_write_byte(cyapa, CYAPA_CMD_POWER_MODE, power);
+        if (ret < 0)
+                dev_err(dev, "failed to set power_mode 0x%02x err = %d\n",
+                        power_mode, ret);
+        return ret;
+}
+
+static int cyapa_get_query_data(struct cyapa *cyapa)
+{
+        u8 query_data[QUERY_DATA_SIZE];
+        int ret;
+
+        if (cyapa->state != CYAPA_STATE_OP)
+                return -EBUSY;
+
+        ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_QUERY, query_data);
+        if (ret < 0)
+                return ret;
+        if (ret != QUERY_DATA_SIZE)
+                return -EIO;
+
+        memcpy(&cyapa->product_id[0], &query_data[0], 5);
+        cyapa->product_id[5] = '-';
+        memcpy(&cyapa->product_id[6], &query_data[5], 6);
+        cyapa->product_id[12] = '-';
+        memcpy(&cyapa->product_id[13], &query_data[11], 2);
+        cyapa->product_id[15] = '\0';
+
+        cyapa->btn_capability = query_data[19] & CAPABILITY_BTN_MASK;
+
+        cyapa->gen = query_data[20] & 0x0f;
+
+        cyapa->max_abs_x = ((query_data[21] & 0xf0) << 4) | query_data[22];
+        cyapa->max_abs_y = ((query_data[21] & 0x0f) << 8) | query_data[23];
+
+        cyapa->physical_size_x =
+                ((query_data[24] & 0xf0) << 4) | query_data[25];
+        cyapa->physical_size_y =
+                ((query_data[24] & 0x0f) << 8) | query_data[26];
+
+        return 0;
+}
+
+/*
+ * Check if device is operational.
+ *
+ * An operational device is responding, has exited bootloader, and has
+ * firmware supported by this driver.
+ *
+ * Returns:
+ *   -EBUSY  no device or in bootloader
+ *   -EIO    failure while reading from device
+ *   -EAGAIN device is still in bootloader
+ *           if ->state = CYAPA_STATE_BL_IDLE, device has invalid firmware
+ *   -EINVAL device is in operational mode, but not supported by this driver
+ *   0       device is supported
+ */
+static int cyapa_check_is_operational(struct cyapa *cyapa)
+{
+        struct device *dev = &cyapa->client->dev;
+        static const char unique_str[] = "CYTRA";
+        int ret;
+
+        ret = cyapa_poll_state(cyapa, 2000);
+        if (ret < 0)
+                return ret;
+        switch (cyapa->state) {
+        case CYAPA_STATE_BL_ACTIVE:
+                ret = cyapa_bl_deactivate(cyapa);
+                if (ret)
+                        return ret;
+
+        /* Fallthrough state */
+        case CYAPA_STATE_BL_IDLE:
+                ret = cyapa_bl_exit(cyapa);
+                if (ret)
+                        return ret;
+
+        /* Fallthrough state */
+        case CYAPA_STATE_OP:
+                ret = cyapa_get_query_data(cyapa);
+                if (ret < 0)
+                        return ret;
+
+                /* only support firmware protocol gen3 */
+                if (cyapa->gen != CYAPA_GEN3) {
+                        dev_err(dev, "unsupported protocol version (%d)",
+                                cyapa->gen);
+                        return -EINVAL;
+                }
+
+                /* only support product ID starting with CYTRA */
+                if (memcmp(cyapa->product_id, unique_str,
+                           sizeof(unique_str) - 1) != 0) {
+                        dev_err(dev, "unsupported product ID (%s)\n",
+                                cyapa->product_id);
+                        return -EINVAL;
+                }
+                return 0;
+
+        default:
+                return -EIO;
+        }
+        return 0;
+}
+
+static irqreturn_t cyapa_irq(int irq, void *dev_id)
+{
+        struct cyapa *cyapa = dev_id;
+        struct device *dev = &cyapa->client->dev;
+        struct input_dev *input = cyapa->input;
+        struct cyapa_reg_data data;
+        int i;
+        int ret;
+        int num_fingers;
+
+        if (device_may_wakeup(dev))
+                pm_wakeup_event(dev, 0);
+
+        ret = cyapa_read_block(cyapa, CYAPA_CMD_GROUP_DATA, (u8 *)&data);
+        if (ret != sizeof(data))
+                goto out;
+
+        if ((data.device_status & OP_STATUS_SRC) != OP_STATUS_SRC ||
+            (data.device_status & OP_STATUS_DEV) != CYAPA_DEV_NORMAL ||
+            (data.finger_btn & OP_DATA_VALID) != OP_DATA_VALID) {
+                goto out;
+        }
+
+        num_fingers = (data.finger_btn >> 4) & 0x0f;
+        for (i = 0; i < num_fingers; i++) {
+                const struct cyapa_touch *touch = &data.touches[i];
+                /* Note: touch->id range is 1 to 15; slots are 0 to 14. */
+                int slot = touch->id - 1;
+
+                input_mt_slot(input, slot);
+                input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+                input_report_abs(input, ABS_MT_POSITION_X,
+                                 ((touch->xy_hi & 0xf0) << 4) | touch->x_lo);
+                input_report_abs(input, ABS_MT_POSITION_Y,
+                                 ((touch->xy_hi & 0x0f) << 8) | touch->y_lo);
+                input_report_abs(input, ABS_MT_PRESSURE, touch->pressure);
+        }
+
+        input_mt_sync_frame(input);
+
+        if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
+                input_report_key(input, BTN_LEFT,
+                                 data.finger_btn & OP_DATA_LEFT_BTN);
+
+        if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
+                input_report_key(input, BTN_MIDDLE,
+                                 data.finger_btn & OP_DATA_MIDDLE_BTN);
+
+        if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
+                input_report_key(input, BTN_RIGHT,
+                                 data.finger_btn & OP_DATA_RIGHT_BTN);
+
+        input_sync(input);
+
+out:
+        return IRQ_HANDLED;
+}
+
+static int cyapa_create_input_dev(struct cyapa *cyapa)
+{
+        struct device *dev = &cyapa->client->dev;
+        int ret;
+        struct input_dev *input;
+
+        if (!cyapa->physical_size_x || !cyapa->physical_size_y)
+                return -EINVAL;
+
+        input = cyapa->input = input_allocate_device();
+        if (!input) {
+                dev_err(dev, "allocate memory for input device failed\n");
+                return -ENOMEM;
+        }
+
+        input->name = CYAPA_NAME;
+        input->phys = cyapa->phys;
+        input->id.bustype = BUS_I2C;
+        input->id.version = 1;
+        input->id.product = 0;  /* means any product in eventcomm. */
+        input->dev.parent = &cyapa->client->dev;
+
+        input_set_drvdata(input, cyapa);
+
+        __set_bit(EV_ABS, input->evbit);
+
+        /* finger position */
+        input_set_abs_params(input, ABS_MT_POSITION_X, 0, cyapa->max_abs_x, 0,
+                             0);
+        input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cyapa->max_abs_y, 0,
+                             0);
+        input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+
+        input_abs_set_res(input, ABS_MT_POSITION_X,
+                          cyapa->max_abs_x / cyapa->physical_size_x);
+        input_abs_set_res(input, ABS_MT_POSITION_Y,
+                          cyapa->max_abs_y / cyapa->physical_size_y);
+
+        if (cyapa->btn_capability & CAPABILITY_LEFT_BTN_MASK)
+                __set_bit(BTN_LEFT, input->keybit);
+        if (cyapa->btn_capability & CAPABILITY_MIDDLE_BTN_MASK)
+                __set_bit(BTN_MIDDLE, input->keybit);
+        if (cyapa->btn_capability & CAPABILITY_RIGHT_BTN_MASK)
+                __set_bit(BTN_RIGHT, input->keybit);
+
+        if (cyapa->btn_capability == CAPABILITY_LEFT_BTN_MASK)
+                __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+
+        /* handle pointer emulation and unused slots in core */
+        ret = input_mt_init_slots(input, CYAPA_MAX_MT_SLOTS,
+                                  INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
+        if (ret) {
+                dev_err(dev, "allocate memory for MT slots failed, %d\n", ret);
+                goto err_free_device;
+        }
+
+        /* Register the device in input subsystem */
+        ret = input_register_device(input);
+        if (ret) {
+                dev_err(dev, "input device register failed, %d\n", ret);
+                goto err_free_device;
+        }
+        return 0;
+
+err_free_device:
+        input_free_device(input);
+        cyapa->input = NULL;
+        return ret;
+}
+
+static int cyapa_probe(struct i2c_client *client,
+                       const struct i2c_device_id *dev_id)
+{
+        int ret;
+        struct cyapa *cyapa;
+        struct device *dev = &client->dev;
+
+        cyapa = kzalloc(sizeof(struct cyapa), GFP_KERNEL);
+        if (!cyapa) {
+                dev_err(dev, "allocate memory for cyapa failed\n");
+                return -ENOMEM;
+        }
+
+        cyapa->gen = CYAPA_GEN3;
+        cyapa->client = client;
+        i2c_set_clientdata(client, cyapa);
+        sprintf(cyapa->phys, "i2c-%d-%04x/input0", client->adapter->nr,
+                client->addr);
+
+        cyapa->state = CYAPA_STATE_NO_DEVICE;
+        ret = cyapa_check_is_operational(cyapa);
+        if (ret) {
+                dev_err(dev, "device not operational, %d\n", ret);
+                goto err_mem_free;
+        }
+
+        ret = cyapa_create_input_dev(cyapa);
+        if (ret) {
+                dev_err(dev, "create input_dev instance failed, %d\n", ret);
+                goto err_mem_free;
+        }
+
+        ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
+        if (ret) {
+                dev_err(dev, "set active power failed, %d\n", ret);
+                goto err_unregister_device;
+        }
+
+        cyapa->irq = client->irq;
+        ret = request_threaded_irq(cyapa->irq,
+                                   NULL,
+                                   cyapa_irq,
+                                   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+                                   "cyapa",
+                                   cyapa);
+        if (ret) {
+                dev_err(dev, "IRQ request failed: %d\n, ", ret);
+                goto err_unregister_device;
+        }
+
+        return 0;
+
+err_unregister_device:
+        input_unregister_device(cyapa->input);
+err_mem_free:
+        kfree(cyapa);
+
+        return ret;
+}
+
+static int cyapa_remove(struct i2c_client *client)
+{
+        struct cyapa *cyapa = i2c_get_clientdata(client);
+
+        free_irq(cyapa->irq, cyapa);
+        input_unregister_device(cyapa->input);
+        cyapa_set_power_mode(cyapa, PWR_MODE_OFF);
+        kfree(cyapa);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cyapa_suspend(struct device *dev)
+{
+        int ret;
+        u8 power_mode;
+        struct cyapa *cyapa = dev_get_drvdata(dev);
+
+        disable_irq(cyapa->irq);
+
+        /*
+         * Set trackpad device to idle mode if wakeup is allowed,
+         * otherwise turn off.
+         */
+        power_mode = device_may_wakeup(dev) ? PWR_MODE_IDLE
+                                            : PWR_MODE_OFF;
+        ret = cyapa_set_power_mode(cyapa, power_mode);
+        if (ret < 0)
+                dev_err(dev, "set power mode failed, %d\n", ret);
+
+        if (device_may_wakeup(dev))
+                cyapa->irq_wake = (enable_irq_wake(cyapa->irq) == 0);
+        return 0;
+}
+
+static int cyapa_resume(struct device *dev)
+{
+        int ret;
+        struct cyapa *cyapa = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(dev) && cyapa->irq_wake)
+                disable_irq_wake(cyapa->irq);
+
+        ret = cyapa_set_power_mode(cyapa, PWR_MODE_FULL_ACTIVE);
+        if (ret)
+                dev_warn(dev, "resume active power failed, %d\n", ret);
+
+        enable_irq(cyapa->irq);
+        return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(cyapa_pm_ops, cyapa_suspend, cyapa_resume);
+
+static const struct i2c_device_id cyapa_id_table[] = {
+        { "cyapa", 0 },
+        { },
+};
+MODULE_DEVICE_TABLE(i2c, cyapa_id_table);
+
+static struct i2c_driver cyapa_driver = {
+        .driver = {
+                .name = "cyapa",
+                .owner = THIS_MODULE,
+                .pm = &cyapa_pm_ops,
+        },
+
+        .probe = cyapa_probe,
+        .remove = cyapa_remove,
+        .id_table = cyapa_id_table,
+};
+
+module_i2c_driver(cyapa_driver);
+
+MODULE_DESCRIPTION("Cypress APA I2C Trackpad Driver");
+MODULE_AUTHOR("Dudley Du <dudl@cypress.com>");
+MODULE_LICENSE("GPL");