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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/touchscreen/bu21013_ts.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/touchscreen/bu21013_ts.c')
-rw-r--r--drivers/input/touchscreen/bu21013_ts.c630
1 files changed, 630 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c
new file mode 100644
index 000000000..34f422e24
--- /dev/null
+++ b/drivers/input/touchscreen/bu21013_ts.c
@@ -0,0 +1,630 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define MAX_FINGERS 2
+#define RESET_DELAY 30
+#define PENUP_TIMEOUT (10)
+#define DELTA_MIN 16
+#define MASK_BITS 0x03
+#define SHIFT_8 8
+#define SHIFT_2 2
+#define LENGTH_OF_BUFFER 11
+#define I2C_RETRY_COUNT 5
+
+#define BU21013_SENSORS_BTN_0_7_REG 0x70
+#define BU21013_SENSORS_BTN_8_15_REG 0x71
+#define BU21013_SENSORS_BTN_16_23_REG 0x72
+#define BU21013_X1_POS_MSB_REG 0x73
+#define BU21013_X1_POS_LSB_REG 0x74
+#define BU21013_Y1_POS_MSB_REG 0x75
+#define BU21013_Y1_POS_LSB_REG 0x76
+#define BU21013_X2_POS_MSB_REG 0x77
+#define BU21013_X2_POS_LSB_REG 0x78
+#define BU21013_Y2_POS_MSB_REG 0x79
+#define BU21013_Y2_POS_LSB_REG 0x7A
+#define BU21013_INT_CLR_REG 0xE8
+#define BU21013_INT_MODE_REG 0xE9
+#define BU21013_GAIN_REG 0xEA
+#define BU21013_OFFSET_MODE_REG 0xEB
+#define BU21013_XY_EDGE_REG 0xEC
+#define BU21013_RESET_REG 0xED
+#define BU21013_CALIB_REG 0xEE
+#define BU21013_DONE_REG 0xEF
+#define BU21013_SENSOR_0_7_REG 0xF0
+#define BU21013_SENSOR_8_15_REG 0xF1
+#define BU21013_SENSOR_16_23_REG 0xF2
+#define BU21013_POS_MODE1_REG 0xF3
+#define BU21013_POS_MODE2_REG 0xF4
+#define BU21013_CLK_MODE_REG 0xF5
+#define BU21013_IDLE_REG 0xFA
+#define BU21013_FILTER_REG 0xFB
+#define BU21013_TH_ON_REG 0xFC
+#define BU21013_TH_OFF_REG 0xFD
+
+
+#define BU21013_RESET_ENABLE 0x01
+
+#define BU21013_SENSORS_EN_0_7 0x3F
+#define BU21013_SENSORS_EN_8_15 0xFC
+#define BU21013_SENSORS_EN_16_23 0x1F
+
+#define BU21013_POS_MODE1_0 0x02
+#define BU21013_POS_MODE1_1 0x04
+#define BU21013_POS_MODE1_2 0x08
+
+#define BU21013_POS_MODE2_ZERO 0x01
+#define BU21013_POS_MODE2_AVG1 0x02
+#define BU21013_POS_MODE2_AVG2 0x04
+#define BU21013_POS_MODE2_EN_XY 0x08
+#define BU21013_POS_MODE2_EN_RAW 0x10
+#define BU21013_POS_MODE2_MULTI 0x80
+
+#define BU21013_CLK_MODE_DIV 0x01
+#define BU21013_CLK_MODE_EXT 0x02
+#define BU21013_CLK_MODE_CALIB 0x80
+
+#define BU21013_IDLET_0 0x01
+#define BU21013_IDLET_1 0x02
+#define BU21013_IDLET_2 0x04
+#define BU21013_IDLET_3 0x08
+#define BU21013_IDLE_INTERMIT_EN 0x10
+
+#define BU21013_DELTA_0_6 0x7F
+#define BU21013_FILTER_EN 0x80
+
+#define BU21013_INT_MODE_LEVEL 0x00
+#define BU21013_INT_MODE_EDGE 0x01
+
+#define BU21013_GAIN_0 0x01
+#define BU21013_GAIN_1 0x02
+#define BU21013_GAIN_2 0x04
+
+#define BU21013_OFFSET_MODE_DEFAULT 0x00
+#define BU21013_OFFSET_MODE_MOVE 0x01
+#define BU21013_OFFSET_MODE_DISABLE 0x02
+
+#define BU21013_TH_ON_0 0x01
+#define BU21013_TH_ON_1 0x02
+#define BU21013_TH_ON_2 0x04
+#define BU21013_TH_ON_3 0x08
+#define BU21013_TH_ON_4 0x10
+#define BU21013_TH_ON_5 0x20
+#define BU21013_TH_ON_6 0x40
+#define BU21013_TH_ON_7 0x80
+#define BU21013_TH_ON_MAX 0xFF
+
+#define BU21013_TH_OFF_0 0x01
+#define BU21013_TH_OFF_1 0x02
+#define BU21013_TH_OFF_2 0x04
+#define BU21013_TH_OFF_3 0x08
+#define BU21013_TH_OFF_4 0x10
+#define BU21013_TH_OFF_5 0x20
+#define BU21013_TH_OFF_6 0x40
+#define BU21013_TH_OFF_7 0x80
+#define BU21013_TH_OFF_MAX 0xFF
+
+#define BU21013_X_EDGE_0 0x01
+#define BU21013_X_EDGE_1 0x02
+#define BU21013_X_EDGE_2 0x04
+#define BU21013_X_EDGE_3 0x08
+#define BU21013_Y_EDGE_0 0x10
+#define BU21013_Y_EDGE_1 0x20
+#define BU21013_Y_EDGE_2 0x40
+#define BU21013_Y_EDGE_3 0x80
+
+#define BU21013_DONE 0x01
+#define BU21013_NUMBER_OF_X_SENSORS (6)
+#define BU21013_NUMBER_OF_Y_SENSORS (11)
+
+#define DRIVER_TP "bu21013_tp"
+
+/**
+ * struct bu21013_ts - touch panel data structure
+ * @client: pointer to the i2c client
+ * @in_dev: pointer to the input device structure
+ * @props: the device coordinate transformation properties
+ * @regulator: pointer to the Regulator used for touch screen
+ * @cs_gpiod: chip select GPIO line
+ * @int_gpiod: touch interrupt GPIO line
+ * @touch_x_max: maximum X coordinate reported by the device
+ * @touch_y_max: maximum Y coordinate reported by the device
+ * @x_flip: indicates that the driver should invert X coordinate before
+ * reporting
+ * @y_flip: indicates that the driver should invert Y coordinate before
+ * reporting
+ * @touch_stopped: touch stop flag
+ *
+ * Touch panel device data structure
+ */
+struct bu21013_ts {
+ struct i2c_client *client;
+ struct input_dev *in_dev;
+ struct touchscreen_properties props;
+ struct regulator *regulator;
+ struct gpio_desc *cs_gpiod;
+ struct gpio_desc *int_gpiod;
+ u32 touch_x_max;
+ u32 touch_y_max;
+ bool x_flip;
+ bool y_flip;
+ bool touch_stopped;
+};
+
+static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf)
+{
+ int ret, i;
+
+ for (i = 0; i < I2C_RETRY_COUNT; i++) {
+ ret = i2c_smbus_read_i2c_block_data(ts->client,
+ BU21013_SENSORS_BTN_0_7_REG,
+ LENGTH_OF_BUFFER, buf);
+ if (ret == LENGTH_OF_BUFFER)
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int bu21013_do_touch_report(struct bu21013_ts *ts)
+{
+ struct input_dev *input = ts->in_dev;
+ struct input_mt_pos pos[MAX_FINGERS];
+ int slots[MAX_FINGERS];
+ u8 buf[LENGTH_OF_BUFFER];
+ bool has_x_sensors, has_y_sensors;
+ int finger_down_count = 0;
+ int i;
+
+ if (bu21013_read_block_data(ts, buf) < 0)
+ return -EINVAL;
+
+ has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
+ has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
+ ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
+ if (!has_x_sensors || !has_y_sensors)
+ return 0;
+
+ for (i = 0; i < MAX_FINGERS; i++) {
+ const u8 *data = &buf[4 * i + 3];
+ unsigned int x, y;
+
+ x = data[0] << SHIFT_2 | (data[1] & MASK_BITS);
+ y = data[2] << SHIFT_2 | (data[3] & MASK_BITS);
+ if (x != 0 && y != 0)
+ touchscreen_set_mt_pos(&pos[finger_down_count++],
+ &ts->props, x, y);
+ }
+
+ if (finger_down_count == 2 &&
+ (abs(pos[0].x - pos[1].x) < DELTA_MIN ||
+ abs(pos[0].y - pos[1].y) < DELTA_MIN)) {
+ return 0;
+ }
+
+ input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN);
+ for (i = 0; i < finger_down_count; i++) {
+ input_mt_slot(input, slots[i]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
+ input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
+ }
+
+ input_mt_sync_frame(input);
+ input_sync(input);
+
+ return 0;
+}
+
+static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
+{
+ struct bu21013_ts *ts = device_data;
+ int keep_polling;
+ int error;
+
+ do {
+ error = bu21013_do_touch_report(ts);
+ if (error) {
+ dev_err(&ts->client->dev, "%s failed\n", __func__);
+ break;
+ }
+
+ if (unlikely(ts->touch_stopped))
+ break;
+
+ keep_polling = ts->int_gpiod ?
+ gpiod_get_value(ts->int_gpiod) : false;
+ if (keep_polling)
+ usleep_range(2000, 2500);
+ } while (keep_polling);
+
+ return IRQ_HANDLED;
+}
+
+static int bu21013_init_chip(struct bu21013_ts *ts)
+{
+ struct i2c_client *client = ts->client;
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, BU21013_RESET_REG,
+ BU21013_RESET_ENABLE);
+ if (error) {
+ dev_err(&client->dev, "BU21013_RESET reg write failed\n");
+ return error;
+ }
+ msleep(RESET_DELAY);
+
+ error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_0_7_REG,
+ BU21013_SENSORS_EN_0_7);
+ if (error) {
+ dev_err(&client->dev, "BU21013_SENSOR_0_7 reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_8_15_REG,
+ BU21013_SENSORS_EN_8_15);
+ if (error) {
+ dev_err(&client->dev, "BU21013_SENSOR_8_15 reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_16_23_REG,
+ BU21013_SENSORS_EN_16_23);
+ if (error) {
+ dev_err(&client->dev, "BU21013_SENSOR_16_23 reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE1_REG,
+ BU21013_POS_MODE1_0 |
+ BU21013_POS_MODE1_1);
+ if (error) {
+ dev_err(&client->dev, "BU21013_POS_MODE1 reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE2_REG,
+ BU21013_POS_MODE2_ZERO |
+ BU21013_POS_MODE2_AVG1 |
+ BU21013_POS_MODE2_AVG2 |
+ BU21013_POS_MODE2_EN_RAW |
+ BU21013_POS_MODE2_MULTI);
+ if (error) {
+ dev_err(&client->dev, "BU21013_POS_MODE2 reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_CLK_MODE_REG,
+ BU21013_CLK_MODE_DIV |
+ BU21013_CLK_MODE_CALIB);
+ if (error) {
+ dev_err(&client->dev, "BU21013_CLK_MODE reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_IDLE_REG,
+ BU21013_IDLET_0 |
+ BU21013_IDLE_INTERMIT_EN);
+ if (error) {
+ dev_err(&client->dev, "BU21013_IDLE reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_INT_MODE_REG,
+ BU21013_INT_MODE_LEVEL);
+ if (error) {
+ dev_err(&client->dev, "BU21013_INT_MODE reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_FILTER_REG,
+ BU21013_DELTA_0_6 |
+ BU21013_FILTER_EN);
+ if (error) {
+ dev_err(&client->dev, "BU21013_FILTER reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_TH_ON_REG,
+ BU21013_TH_ON_5);
+ if (error) {
+ dev_err(&client->dev, "BU21013_TH_ON reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_TH_OFF_REG,
+ BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
+ if (error) {
+ dev_err(&client->dev, "BU21013_TH_OFF reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_GAIN_REG,
+ BU21013_GAIN_0 | BU21013_GAIN_1);
+ if (error) {
+ dev_err(&client->dev, "BU21013_GAIN reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_OFFSET_MODE_REG,
+ BU21013_OFFSET_MODE_DEFAULT);
+ if (error) {
+ dev_err(&client->dev, "BU21013_OFFSET_MODE reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_XY_EDGE_REG,
+ BU21013_X_EDGE_0 |
+ BU21013_X_EDGE_2 |
+ BU21013_Y_EDGE_1 |
+ BU21013_Y_EDGE_3);
+ if (error) {
+ dev_err(&client->dev, "BU21013_XY_EDGE reg write failed\n");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, BU21013_DONE_REG,
+ BU21013_DONE);
+ if (error) {
+ dev_err(&client->dev, "BU21013_REG_DONE reg write failed\n");
+ return error;
+ }
+
+ return 0;
+}
+
+static void bu21013_power_off(void *_ts)
+{
+ struct bu21013_ts *ts = _ts;
+
+ regulator_disable(ts->regulator);
+}
+
+static void bu21013_disable_chip(void *_ts)
+{
+ struct bu21013_ts *ts = _ts;
+
+ gpiod_set_value(ts->cs_gpiod, 0);
+}
+
+static int bu21013_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bu21013_ts *ts;
+ struct input_dev *in_dev;
+ struct input_absinfo *info;
+ u32 max_x = 0, max_y = 0;
+ int error;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&client->dev, "i2c smbus byte data not supported\n");
+ return -EIO;
+ }
+
+ if (!client->irq) {
+ dev_err(&client->dev, "No IRQ set up\n");
+ return -EINVAL;
+ }
+
+ ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->client = client;
+
+ ts->x_flip = device_property_read_bool(&client->dev, "rohm,flip-x");
+ ts->y_flip = device_property_read_bool(&client->dev, "rohm,flip-y");
+
+ in_dev = devm_input_allocate_device(&client->dev);
+ if (!in_dev) {
+ dev_err(&client->dev, "device memory alloc failed\n");
+ return -ENOMEM;
+ }
+ ts->in_dev = in_dev;
+ input_set_drvdata(in_dev, ts);
+
+ /* register the device to input subsystem */
+ in_dev->name = DRIVER_TP;
+ in_dev->id.bustype = BUS_I2C;
+
+ device_property_read_u32(&client->dev, "rohm,touch-max-x", &max_x);
+ device_property_read_u32(&client->dev, "rohm,touch-max-y", &max_y);
+
+ input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0);
+ input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
+
+ touchscreen_parse_properties(in_dev, true, &ts->props);
+
+ /* Adjust for the legacy "flip" properties, if present */
+ if (!ts->props.invert_x &&
+ device_property_read_bool(&client->dev, "rohm,flip-x")) {
+ info = &in_dev->absinfo[ABS_MT_POSITION_X];
+ info->maximum -= info->minimum;
+ info->minimum = 0;
+ }
+
+ if (!ts->props.invert_y &&
+ device_property_read_bool(&client->dev, "rohm,flip-y")) {
+ info = &in_dev->absinfo[ABS_MT_POSITION_Y];
+ info->maximum -= info->minimum;
+ info->minimum = 0;
+ }
+
+ error = input_mt_init_slots(in_dev, MAX_FINGERS,
+ INPUT_MT_DIRECT | INPUT_MT_TRACK |
+ INPUT_MT_DROP_UNUSED);
+ if (error) {
+ dev_err(&client->dev, "failed to initialize MT slots");
+ return error;
+ }
+
+ ts->regulator = devm_regulator_get(&client->dev, "avdd");
+ if (IS_ERR(ts->regulator)) {
+ dev_err(&client->dev, "regulator_get failed\n");
+ return PTR_ERR(ts->regulator);
+ }
+
+ error = regulator_enable(ts->regulator);
+ if (error) {
+ dev_err(&client->dev, "regulator enable failed\n");
+ return error;
+ }
+
+ error = devm_add_action_or_reset(&client->dev, bu21013_power_off, ts);
+ if (error) {
+ dev_err(&client->dev, "failed to install power off handler\n");
+ return error;
+ }
+
+ /* Named "CS" on the chip, DT binding is "reset" */
+ ts->cs_gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
+ error = PTR_ERR_OR_ZERO(ts->cs_gpiod);
+ if (error) {
+ if (error != -EPROBE_DEFER)
+ dev_err(&client->dev, "failed to get CS GPIO\n");
+ return error;
+ }
+ gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS");
+
+ error = devm_add_action_or_reset(&client->dev,
+ bu21013_disable_chip, ts);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to install chip disable handler\n");
+ return error;
+ }
+
+ /* Named "INT" on the chip, DT binding is "touch" */
+ ts->int_gpiod = devm_gpiod_get_optional(&client->dev,
+ "touch", GPIOD_IN);
+ error = PTR_ERR_OR_ZERO(ts->int_gpiod);
+ if (error) {
+ if (error != -EPROBE_DEFER)
+ dev_err(&client->dev, "failed to get INT GPIO\n");
+ return error;
+ }
+
+ if (ts->int_gpiod)
+ gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT");
+
+ /* configure the touch panel controller */
+ error = bu21013_init_chip(ts);
+ if (error) {
+ dev_err(&client->dev, "error in bu21013 config\n");
+ return error;
+ }
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, bu21013_gpio_irq,
+ IRQF_ONESHOT, DRIVER_TP, ts);
+ if (error) {
+ dev_err(&client->dev, "request irq %d failed\n",
+ client->irq);
+ return error;
+ }
+
+ error = input_register_device(in_dev);
+ if (error) {
+ dev_err(&client->dev, "failed to register input device\n");
+ return error;
+ }
+
+ i2c_set_clientdata(client, ts);
+
+ return 0;
+}
+
+static void bu21013_remove(struct i2c_client *client)
+{
+ struct bu21013_ts *ts = i2c_get_clientdata(client);
+
+ /* Make sure IRQ will exit quickly even if there is contact */
+ ts->touch_stopped = true;
+ /* The resources will be freed by devm */
+}
+
+static int __maybe_unused bu21013_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bu21013_ts *ts = i2c_get_clientdata(client);
+
+ ts->touch_stopped = true;
+ mb();
+ disable_irq(client->irq);
+
+ if (!device_may_wakeup(&client->dev))
+ regulator_disable(ts->regulator);
+
+ return 0;
+}
+
+static int __maybe_unused bu21013_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bu21013_ts *ts = i2c_get_clientdata(client);
+ int error;
+
+ if (!device_may_wakeup(&client->dev)) {
+ error = regulator_enable(ts->regulator);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to re-enable regulator when resuming\n");
+ return error;
+ }
+
+ error = bu21013_init_chip(ts);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to reinitialize chip when resuming\n");
+ return error;
+ }
+ }
+
+ ts->touch_stopped = false;
+ mb();
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(bu21013_dev_pm_ops, bu21013_suspend, bu21013_resume);
+
+static const struct i2c_device_id bu21013_id[] = {
+ { DRIVER_TP, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, bu21013_id);
+
+static struct i2c_driver bu21013_driver = {
+ .driver = {
+ .name = DRIVER_TP,
+ .pm = &bu21013_dev_pm_ops,
+ },
+ .probe = bu21013_probe,
+ .remove = bu21013_remove,
+ .id_table = bu21013_id,
+};
+
+module_i2c_driver(bu21013_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
+MODULE_DESCRIPTION("bu21013 touch screen controller driver");