1af873fceSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
24780c8dfSNaveen Kumar Gaddipati /*
34780c8dfSNaveen Kumar Gaddipati * Copyright (C) ST-Ericsson SA 2010
44780c8dfSNaveen Kumar Gaddipati * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
54780c8dfSNaveen Kumar Gaddipati */
64780c8dfSNaveen Kumar Gaddipati
71eb7b4caSDmitry Torokhov #include <linux/bitops.h>
84780c8dfSNaveen Kumar Gaddipati #include <linux/delay.h>
9a1b70a44SLinus Walleij #include <linux/gpio/consumer.h>
101eb7b4caSDmitry Torokhov #include <linux/i2c.h>
111eb7b4caSDmitry Torokhov #include <linux/input.h>
12307ec663SDmitry Torokhov #include <linux/input/mt.h>
134b6253faSDmitry Torokhov #include <linux/input/touchscreen.h>
141eb7b4caSDmitry Torokhov #include <linux/interrupt.h>
151eb7b4caSDmitry Torokhov #include <linux/kernel.h>
161eb7b4caSDmitry Torokhov #include <linux/module.h>
171eb7b4caSDmitry Torokhov #include <linux/property.h>
181eb7b4caSDmitry Torokhov #include <linux/regulator/consumer.h>
191eb7b4caSDmitry Torokhov #include <linux/slab.h>
201eb7b4caSDmitry Torokhov #include <linux/types.h>
214780c8dfSNaveen Kumar Gaddipati
224780c8dfSNaveen Kumar Gaddipati #define MAX_FINGERS 2
234780c8dfSNaveen Kumar Gaddipati #define RESET_DELAY 30
244780c8dfSNaveen Kumar Gaddipati #define PENUP_TIMEOUT (10)
254780c8dfSNaveen Kumar Gaddipati #define DELTA_MIN 16
264780c8dfSNaveen Kumar Gaddipati #define MASK_BITS 0x03
274780c8dfSNaveen Kumar Gaddipati #define SHIFT_8 8
284780c8dfSNaveen Kumar Gaddipati #define SHIFT_2 2
294780c8dfSNaveen Kumar Gaddipati #define LENGTH_OF_BUFFER 11
304780c8dfSNaveen Kumar Gaddipati #define I2C_RETRY_COUNT 5
314780c8dfSNaveen Kumar Gaddipati
324780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSORS_BTN_0_7_REG 0x70
334780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSORS_BTN_8_15_REG 0x71
344780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSORS_BTN_16_23_REG 0x72
354780c8dfSNaveen Kumar Gaddipati #define BU21013_X1_POS_MSB_REG 0x73
364780c8dfSNaveen Kumar Gaddipati #define BU21013_X1_POS_LSB_REG 0x74
374780c8dfSNaveen Kumar Gaddipati #define BU21013_Y1_POS_MSB_REG 0x75
384780c8dfSNaveen Kumar Gaddipati #define BU21013_Y1_POS_LSB_REG 0x76
394780c8dfSNaveen Kumar Gaddipati #define BU21013_X2_POS_MSB_REG 0x77
404780c8dfSNaveen Kumar Gaddipati #define BU21013_X2_POS_LSB_REG 0x78
414780c8dfSNaveen Kumar Gaddipati #define BU21013_Y2_POS_MSB_REG 0x79
424780c8dfSNaveen Kumar Gaddipati #define BU21013_Y2_POS_LSB_REG 0x7A
434780c8dfSNaveen Kumar Gaddipati #define BU21013_INT_CLR_REG 0xE8
444780c8dfSNaveen Kumar Gaddipati #define BU21013_INT_MODE_REG 0xE9
454780c8dfSNaveen Kumar Gaddipati #define BU21013_GAIN_REG 0xEA
464780c8dfSNaveen Kumar Gaddipati #define BU21013_OFFSET_MODE_REG 0xEB
474780c8dfSNaveen Kumar Gaddipati #define BU21013_XY_EDGE_REG 0xEC
484780c8dfSNaveen Kumar Gaddipati #define BU21013_RESET_REG 0xED
494780c8dfSNaveen Kumar Gaddipati #define BU21013_CALIB_REG 0xEE
504780c8dfSNaveen Kumar Gaddipati #define BU21013_DONE_REG 0xEF
514780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSOR_0_7_REG 0xF0
524780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSOR_8_15_REG 0xF1
534780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSOR_16_23_REG 0xF2
544780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE1_REG 0xF3
554780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE2_REG 0xF4
564780c8dfSNaveen Kumar Gaddipati #define BU21013_CLK_MODE_REG 0xF5
574780c8dfSNaveen Kumar Gaddipati #define BU21013_IDLE_REG 0xFA
584780c8dfSNaveen Kumar Gaddipati #define BU21013_FILTER_REG 0xFB
594780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_REG 0xFC
604780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_REG 0xFD
614780c8dfSNaveen Kumar Gaddipati
624780c8dfSNaveen Kumar Gaddipati
634780c8dfSNaveen Kumar Gaddipati #define BU21013_RESET_ENABLE 0x01
644780c8dfSNaveen Kumar Gaddipati
654780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSORS_EN_0_7 0x3F
664780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSORS_EN_8_15 0xFC
674780c8dfSNaveen Kumar Gaddipati #define BU21013_SENSORS_EN_16_23 0x1F
684780c8dfSNaveen Kumar Gaddipati
694780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE1_0 0x02
704780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE1_1 0x04
714780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE1_2 0x08
724780c8dfSNaveen Kumar Gaddipati
734780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE2_ZERO 0x01
744780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE2_AVG1 0x02
754780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE2_AVG2 0x04
764780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE2_EN_XY 0x08
774780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE2_EN_RAW 0x10
784780c8dfSNaveen Kumar Gaddipati #define BU21013_POS_MODE2_MULTI 0x80
794780c8dfSNaveen Kumar Gaddipati
804780c8dfSNaveen Kumar Gaddipati #define BU21013_CLK_MODE_DIV 0x01
814780c8dfSNaveen Kumar Gaddipati #define BU21013_CLK_MODE_EXT 0x02
824780c8dfSNaveen Kumar Gaddipati #define BU21013_CLK_MODE_CALIB 0x80
834780c8dfSNaveen Kumar Gaddipati
844780c8dfSNaveen Kumar Gaddipati #define BU21013_IDLET_0 0x01
854780c8dfSNaveen Kumar Gaddipati #define BU21013_IDLET_1 0x02
864780c8dfSNaveen Kumar Gaddipati #define BU21013_IDLET_2 0x04
874780c8dfSNaveen Kumar Gaddipati #define BU21013_IDLET_3 0x08
884780c8dfSNaveen Kumar Gaddipati #define BU21013_IDLE_INTERMIT_EN 0x10
894780c8dfSNaveen Kumar Gaddipati
904780c8dfSNaveen Kumar Gaddipati #define BU21013_DELTA_0_6 0x7F
914780c8dfSNaveen Kumar Gaddipati #define BU21013_FILTER_EN 0x80
924780c8dfSNaveen Kumar Gaddipati
934780c8dfSNaveen Kumar Gaddipati #define BU21013_INT_MODE_LEVEL 0x00
944780c8dfSNaveen Kumar Gaddipati #define BU21013_INT_MODE_EDGE 0x01
954780c8dfSNaveen Kumar Gaddipati
964780c8dfSNaveen Kumar Gaddipati #define BU21013_GAIN_0 0x01
974780c8dfSNaveen Kumar Gaddipati #define BU21013_GAIN_1 0x02
984780c8dfSNaveen Kumar Gaddipati #define BU21013_GAIN_2 0x04
994780c8dfSNaveen Kumar Gaddipati
1004780c8dfSNaveen Kumar Gaddipati #define BU21013_OFFSET_MODE_DEFAULT 0x00
1014780c8dfSNaveen Kumar Gaddipati #define BU21013_OFFSET_MODE_MOVE 0x01
1024780c8dfSNaveen Kumar Gaddipati #define BU21013_OFFSET_MODE_DISABLE 0x02
1034780c8dfSNaveen Kumar Gaddipati
1044780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_0 0x01
1054780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_1 0x02
1064780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_2 0x04
1074780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_3 0x08
1084780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_4 0x10
1094780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_5 0x20
1104780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_6 0x40
1114780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_7 0x80
1124780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_ON_MAX 0xFF
1134780c8dfSNaveen Kumar Gaddipati
1144780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_0 0x01
1154780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_1 0x02
1164780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_2 0x04
1174780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_3 0x08
1184780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_4 0x10
1194780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_5 0x20
1204780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_6 0x40
1214780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_7 0x80
1224780c8dfSNaveen Kumar Gaddipati #define BU21013_TH_OFF_MAX 0xFF
1234780c8dfSNaveen Kumar Gaddipati
1244780c8dfSNaveen Kumar Gaddipati #define BU21013_X_EDGE_0 0x01
1254780c8dfSNaveen Kumar Gaddipati #define BU21013_X_EDGE_1 0x02
1264780c8dfSNaveen Kumar Gaddipati #define BU21013_X_EDGE_2 0x04
1274780c8dfSNaveen Kumar Gaddipati #define BU21013_X_EDGE_3 0x08
1284780c8dfSNaveen Kumar Gaddipati #define BU21013_Y_EDGE_0 0x10
1294780c8dfSNaveen Kumar Gaddipati #define BU21013_Y_EDGE_1 0x20
1304780c8dfSNaveen Kumar Gaddipati #define BU21013_Y_EDGE_2 0x40
1314780c8dfSNaveen Kumar Gaddipati #define BU21013_Y_EDGE_3 0x80
1324780c8dfSNaveen Kumar Gaddipati
1334780c8dfSNaveen Kumar Gaddipati #define BU21013_DONE 0x01
1344780c8dfSNaveen Kumar Gaddipati #define BU21013_NUMBER_OF_X_SENSORS (6)
1354780c8dfSNaveen Kumar Gaddipati #define BU21013_NUMBER_OF_Y_SENSORS (11)
1364780c8dfSNaveen Kumar Gaddipati
1374780c8dfSNaveen Kumar Gaddipati #define DRIVER_TP "bu21013_tp"
1384780c8dfSNaveen Kumar Gaddipati
1394780c8dfSNaveen Kumar Gaddipati /**
140a866781eSDmitry Torokhov * struct bu21013_ts - touch panel data structure
1414780c8dfSNaveen Kumar Gaddipati * @client: pointer to the i2c client
1424780c8dfSNaveen Kumar Gaddipati * @in_dev: pointer to the input device structure
1434b6253faSDmitry Torokhov * @props: the device coordinate transformation properties
14481e78deaSNaveen Kumar Gaddipati * @regulator: pointer to the Regulator used for touch screen
145a1b70a44SLinus Walleij * @cs_gpiod: chip select GPIO line
146a1b70a44SLinus Walleij * @int_gpiod: touch interrupt GPIO line
1471eb7b4caSDmitry Torokhov * @touch_x_max: maximum X coordinate reported by the device
1481eb7b4caSDmitry Torokhov * @touch_y_max: maximum Y coordinate reported by the device
1491eb7b4caSDmitry Torokhov * @x_flip: indicates that the driver should invert X coordinate before
1501eb7b4caSDmitry Torokhov * reporting
1511eb7b4caSDmitry Torokhov * @y_flip: indicates that the driver should invert Y coordinate before
1521eb7b4caSDmitry Torokhov * reporting
1531eb7b4caSDmitry Torokhov * @touch_stopped: touch stop flag
1544780c8dfSNaveen Kumar Gaddipati *
1554780c8dfSNaveen Kumar Gaddipati * Touch panel device data structure
1564780c8dfSNaveen Kumar Gaddipati */
157a866781eSDmitry Torokhov struct bu21013_ts {
1584780c8dfSNaveen Kumar Gaddipati struct i2c_client *client;
1594780c8dfSNaveen Kumar Gaddipati struct input_dev *in_dev;
1604b6253faSDmitry Torokhov struct touchscreen_properties props;
16181e78deaSNaveen Kumar Gaddipati struct regulator *regulator;
162a1b70a44SLinus Walleij struct gpio_desc *cs_gpiod;
163a1b70a44SLinus Walleij struct gpio_desc *int_gpiod;
1641eb7b4caSDmitry Torokhov u32 touch_x_max;
1651eb7b4caSDmitry Torokhov u32 touch_y_max;
1661eb7b4caSDmitry Torokhov bool x_flip;
1671eb7b4caSDmitry Torokhov bool y_flip;
16831fbcda7SLee Jones bool touch_stopped;
1694780c8dfSNaveen Kumar Gaddipati };
1704780c8dfSNaveen Kumar Gaddipati
bu21013_read_block_data(struct bu21013_ts * ts,u8 * buf)171a866781eSDmitry Torokhov static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf)
1724780c8dfSNaveen Kumar Gaddipati {
1734780c8dfSNaveen Kumar Gaddipati int ret, i;
1744780c8dfSNaveen Kumar Gaddipati
1754780c8dfSNaveen Kumar Gaddipati for (i = 0; i < I2C_RETRY_COUNT; i++) {
176a866781eSDmitry Torokhov ret = i2c_smbus_read_i2c_block_data(ts->client,
177a866781eSDmitry Torokhov BU21013_SENSORS_BTN_0_7_REG,
1784780c8dfSNaveen Kumar Gaddipati LENGTH_OF_BUFFER, buf);
1794780c8dfSNaveen Kumar Gaddipati if (ret == LENGTH_OF_BUFFER)
1804780c8dfSNaveen Kumar Gaddipati return 0;
1814780c8dfSNaveen Kumar Gaddipati }
182a866781eSDmitry Torokhov
1834780c8dfSNaveen Kumar Gaddipati return -EINVAL;
1844780c8dfSNaveen Kumar Gaddipati }
1854780c8dfSNaveen Kumar Gaddipati
bu21013_do_touch_report(struct bu21013_ts * ts)186a866781eSDmitry Torokhov static int bu21013_do_touch_report(struct bu21013_ts *ts)
1874780c8dfSNaveen Kumar Gaddipati {
188307ec663SDmitry Torokhov struct input_dev *input = ts->in_dev;
189307ec663SDmitry Torokhov struct input_mt_pos pos[MAX_FINGERS];
190307ec663SDmitry Torokhov int slots[MAX_FINGERS];
1914780c8dfSNaveen Kumar Gaddipati u8 buf[LENGTH_OF_BUFFER];
1924780c8dfSNaveen Kumar Gaddipati bool has_x_sensors, has_y_sensors;
1934780c8dfSNaveen Kumar Gaddipati int finger_down_count = 0;
1944780c8dfSNaveen Kumar Gaddipati int i;
1954780c8dfSNaveen Kumar Gaddipati
196a866781eSDmitry Torokhov if (bu21013_read_block_data(ts, buf) < 0)
1974780c8dfSNaveen Kumar Gaddipati return -EINVAL;
1984780c8dfSNaveen Kumar Gaddipati
1994780c8dfSNaveen Kumar Gaddipati has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7);
2004780c8dfSNaveen Kumar Gaddipati has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) |
2014780c8dfSNaveen Kumar Gaddipati ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2);
2024780c8dfSNaveen Kumar Gaddipati if (!has_x_sensors || !has_y_sensors)
2034780c8dfSNaveen Kumar Gaddipati return 0;
2044780c8dfSNaveen Kumar Gaddipati
2054780c8dfSNaveen Kumar Gaddipati for (i = 0; i < MAX_FINGERS; i++) {
206307ec663SDmitry Torokhov const u8 *data = &buf[4 * i + 3];
2074b6253faSDmitry Torokhov unsigned int x, y;
208307ec663SDmitry Torokhov
2094b6253faSDmitry Torokhov x = data[0] << SHIFT_2 | (data[1] & MASK_BITS);
2104b6253faSDmitry Torokhov y = data[2] << SHIFT_2 | (data[3] & MASK_BITS);
2114b6253faSDmitry Torokhov if (x != 0 && y != 0)
2124b6253faSDmitry Torokhov touchscreen_set_mt_pos(&pos[finger_down_count++],
2134b6253faSDmitry Torokhov &ts->props, x, y);
2144780c8dfSNaveen Kumar Gaddipati }
2154780c8dfSNaveen Kumar Gaddipati
2164780c8dfSNaveen Kumar Gaddipati if (finger_down_count == 2 &&
217307ec663SDmitry Torokhov (abs(pos[0].x - pos[1].x) < DELTA_MIN ||
218307ec663SDmitry Torokhov abs(pos[0].y - pos[1].y) < DELTA_MIN)) {
2194780c8dfSNaveen Kumar Gaddipati return 0;
2204780c8dfSNaveen Kumar Gaddipati }
2214780c8dfSNaveen Kumar Gaddipati
222307ec663SDmitry Torokhov input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN);
2234780c8dfSNaveen Kumar Gaddipati for (i = 0; i < finger_down_count; i++) {
224307ec663SDmitry Torokhov input_mt_slot(input, slots[i]);
225307ec663SDmitry Torokhov input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
226307ec663SDmitry Torokhov input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
227307ec663SDmitry Torokhov input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
2284780c8dfSNaveen Kumar Gaddipati }
2294780c8dfSNaveen Kumar Gaddipati
230307ec663SDmitry Torokhov input_mt_sync_frame(input);
231307ec663SDmitry Torokhov input_sync(input);
2324780c8dfSNaveen Kumar Gaddipati
2334780c8dfSNaveen Kumar Gaddipati return 0;
2344780c8dfSNaveen Kumar Gaddipati }
235a5ee351dSDmitry Torokhov
bu21013_gpio_irq(int irq,void * device_data)2364780c8dfSNaveen Kumar Gaddipati static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
2374780c8dfSNaveen Kumar Gaddipati {
238a866781eSDmitry Torokhov struct bu21013_ts *ts = device_data;
239a1b70a44SLinus Walleij int keep_polling;
240a866781eSDmitry Torokhov int error;
2414780c8dfSNaveen Kumar Gaddipati
2424780c8dfSNaveen Kumar Gaddipati do {
243a866781eSDmitry Torokhov error = bu21013_do_touch_report(ts);
244a866781eSDmitry Torokhov if (error) {
245a866781eSDmitry Torokhov dev_err(&ts->client->dev, "%s failed\n", __func__);
246a1b70a44SLinus Walleij break;
2474780c8dfSNaveen Kumar Gaddipati }
2484780c8dfSNaveen Kumar Gaddipati
249caeb1aaeSDmitry Torokhov if (unlikely(ts->touch_stopped))
250caeb1aaeSDmitry Torokhov break;
251caeb1aaeSDmitry Torokhov
252db3e34d4SDmitry Torokhov keep_polling = ts->int_gpiod ?
253db3e34d4SDmitry Torokhov gpiod_get_value(ts->int_gpiod) : false;
254a1b70a44SLinus Walleij if (keep_polling)
255caeb1aaeSDmitry Torokhov usleep_range(2000, 2500);
256caeb1aaeSDmitry Torokhov } while (keep_polling);
2574780c8dfSNaveen Kumar Gaddipati
2584780c8dfSNaveen Kumar Gaddipati return IRQ_HANDLED;
2594780c8dfSNaveen Kumar Gaddipati }
2604780c8dfSNaveen Kumar Gaddipati
bu21013_init_chip(struct bu21013_ts * ts)261a866781eSDmitry Torokhov static int bu21013_init_chip(struct bu21013_ts *ts)
2624780c8dfSNaveen Kumar Gaddipati {
263a866781eSDmitry Torokhov struct i2c_client *client = ts->client;
264a866781eSDmitry Torokhov int error;
2654780c8dfSNaveen Kumar Gaddipati
266a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_RESET_REG,
2674780c8dfSNaveen Kumar Gaddipati BU21013_RESET_ENABLE);
268a866781eSDmitry Torokhov if (error) {
269a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_RESET reg write failed\n");
270a866781eSDmitry Torokhov return error;
2714780c8dfSNaveen Kumar Gaddipati }
2724780c8dfSNaveen Kumar Gaddipati msleep(RESET_DELAY);
2734780c8dfSNaveen Kumar Gaddipati
274a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_0_7_REG,
2754780c8dfSNaveen Kumar Gaddipati BU21013_SENSORS_EN_0_7);
276a866781eSDmitry Torokhov if (error) {
277a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_SENSOR_0_7 reg write failed\n");
278a866781eSDmitry Torokhov return error;
2794780c8dfSNaveen Kumar Gaddipati }
2804780c8dfSNaveen Kumar Gaddipati
281a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_8_15_REG,
2824780c8dfSNaveen Kumar Gaddipati BU21013_SENSORS_EN_8_15);
283a866781eSDmitry Torokhov if (error) {
284a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_SENSOR_8_15 reg write failed\n");
285a866781eSDmitry Torokhov return error;
2864780c8dfSNaveen Kumar Gaddipati }
2874780c8dfSNaveen Kumar Gaddipati
288a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_16_23_REG,
2894780c8dfSNaveen Kumar Gaddipati BU21013_SENSORS_EN_16_23);
290a866781eSDmitry Torokhov if (error) {
291a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_SENSOR_16_23 reg write failed\n");
292a866781eSDmitry Torokhov return error;
2934780c8dfSNaveen Kumar Gaddipati }
2944780c8dfSNaveen Kumar Gaddipati
295a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE1_REG,
296a866781eSDmitry Torokhov BU21013_POS_MODE1_0 |
297a866781eSDmitry Torokhov BU21013_POS_MODE1_1);
298a866781eSDmitry Torokhov if (error) {
299a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_POS_MODE1 reg write failed\n");
300a866781eSDmitry Torokhov return error;
3014780c8dfSNaveen Kumar Gaddipati }
3024780c8dfSNaveen Kumar Gaddipati
303a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE2_REG,
304a866781eSDmitry Torokhov BU21013_POS_MODE2_ZERO |
305a866781eSDmitry Torokhov BU21013_POS_MODE2_AVG1 |
306a866781eSDmitry Torokhov BU21013_POS_MODE2_AVG2 |
307a866781eSDmitry Torokhov BU21013_POS_MODE2_EN_RAW |
308a866781eSDmitry Torokhov BU21013_POS_MODE2_MULTI);
309a866781eSDmitry Torokhov if (error) {
310a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_POS_MODE2 reg write failed\n");
311a866781eSDmitry Torokhov return error;
3124780c8dfSNaveen Kumar Gaddipati }
3134780c8dfSNaveen Kumar Gaddipati
314a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_CLK_MODE_REG,
315a866781eSDmitry Torokhov BU21013_CLK_MODE_DIV |
316a866781eSDmitry Torokhov BU21013_CLK_MODE_CALIB);
317a866781eSDmitry Torokhov if (error) {
318a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_CLK_MODE reg write failed\n");
319a866781eSDmitry Torokhov return error;
3204780c8dfSNaveen Kumar Gaddipati }
3214780c8dfSNaveen Kumar Gaddipati
322a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_IDLE_REG,
323a866781eSDmitry Torokhov BU21013_IDLET_0 |
324a866781eSDmitry Torokhov BU21013_IDLE_INTERMIT_EN);
325a866781eSDmitry Torokhov if (error) {
326a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_IDLE reg write failed\n");
327a866781eSDmitry Torokhov return error;
3284780c8dfSNaveen Kumar Gaddipati }
3294780c8dfSNaveen Kumar Gaddipati
330a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_INT_MODE_REG,
3314780c8dfSNaveen Kumar Gaddipati BU21013_INT_MODE_LEVEL);
332a866781eSDmitry Torokhov if (error) {
333a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_INT_MODE reg write failed\n");
334a866781eSDmitry Torokhov return error;
3354780c8dfSNaveen Kumar Gaddipati }
3364780c8dfSNaveen Kumar Gaddipati
337a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_FILTER_REG,
338a866781eSDmitry Torokhov BU21013_DELTA_0_6 |
339a866781eSDmitry Torokhov BU21013_FILTER_EN);
340a866781eSDmitry Torokhov if (error) {
341a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_FILTER reg write failed\n");
342a866781eSDmitry Torokhov return error;
3434780c8dfSNaveen Kumar Gaddipati }
3444780c8dfSNaveen Kumar Gaddipati
345a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_TH_ON_REG,
3464780c8dfSNaveen Kumar Gaddipati BU21013_TH_ON_5);
347a866781eSDmitry Torokhov if (error) {
348a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_TH_ON reg write failed\n");
349a866781eSDmitry Torokhov return error;
3504780c8dfSNaveen Kumar Gaddipati }
3514780c8dfSNaveen Kumar Gaddipati
352a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_TH_OFF_REG,
353ef11e701SDavid Sterba BU21013_TH_OFF_4 | BU21013_TH_OFF_3);
354a866781eSDmitry Torokhov if (error) {
355a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_TH_OFF reg write failed\n");
356a866781eSDmitry Torokhov return error;
3574780c8dfSNaveen Kumar Gaddipati }
3584780c8dfSNaveen Kumar Gaddipati
359a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_GAIN_REG,
360a866781eSDmitry Torokhov BU21013_GAIN_0 | BU21013_GAIN_1);
361a866781eSDmitry Torokhov if (error) {
362a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_GAIN reg write failed\n");
363a866781eSDmitry Torokhov return error;
3644780c8dfSNaveen Kumar Gaddipati }
3654780c8dfSNaveen Kumar Gaddipati
366a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_OFFSET_MODE_REG,
3674780c8dfSNaveen Kumar Gaddipati BU21013_OFFSET_MODE_DEFAULT);
368a866781eSDmitry Torokhov if (error) {
369a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_OFFSET_MODE reg write failed\n");
370a866781eSDmitry Torokhov return error;
3714780c8dfSNaveen Kumar Gaddipati }
3724780c8dfSNaveen Kumar Gaddipati
373a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_XY_EDGE_REG,
374a866781eSDmitry Torokhov BU21013_X_EDGE_0 |
375a866781eSDmitry Torokhov BU21013_X_EDGE_2 |
376a866781eSDmitry Torokhov BU21013_Y_EDGE_1 |
377a866781eSDmitry Torokhov BU21013_Y_EDGE_3);
378a866781eSDmitry Torokhov if (error) {
379a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_XY_EDGE reg write failed\n");
380a866781eSDmitry Torokhov return error;
3814780c8dfSNaveen Kumar Gaddipati }
3824780c8dfSNaveen Kumar Gaddipati
383a866781eSDmitry Torokhov error = i2c_smbus_write_byte_data(client, BU21013_DONE_REG,
3844780c8dfSNaveen Kumar Gaddipati BU21013_DONE);
385a866781eSDmitry Torokhov if (error) {
386a866781eSDmitry Torokhov dev_err(&client->dev, "BU21013_REG_DONE reg write failed\n");
387a866781eSDmitry Torokhov return error;
3884780c8dfSNaveen Kumar Gaddipati }
3894780c8dfSNaveen Kumar Gaddipati
3904780c8dfSNaveen Kumar Gaddipati return 0;
3914780c8dfSNaveen Kumar Gaddipati }
3924780c8dfSNaveen Kumar Gaddipati
bu21013_power_off(void * _ts)393caeb1aaeSDmitry Torokhov static void bu21013_power_off(void *_ts)
394caeb1aaeSDmitry Torokhov {
395caeb1aaeSDmitry Torokhov struct bu21013_ts *ts = _ts;
396caeb1aaeSDmitry Torokhov
397caeb1aaeSDmitry Torokhov regulator_disable(ts->regulator);
398caeb1aaeSDmitry Torokhov }
399caeb1aaeSDmitry Torokhov
bu21013_disable_chip(void * _ts)400caeb1aaeSDmitry Torokhov static void bu21013_disable_chip(void *_ts)
401caeb1aaeSDmitry Torokhov {
402caeb1aaeSDmitry Torokhov struct bu21013_ts *ts = _ts;
403caeb1aaeSDmitry Torokhov
404caeb1aaeSDmitry Torokhov gpiod_set_value(ts->cs_gpiod, 0);
405caeb1aaeSDmitry Torokhov }
406caeb1aaeSDmitry Torokhov
bu21013_probe(struct i2c_client * client)407f1a1ea01SUwe Kleine-König static int bu21013_probe(struct i2c_client *client)
4084780c8dfSNaveen Kumar Gaddipati {
409a866781eSDmitry Torokhov struct bu21013_ts *ts;
4104780c8dfSNaveen Kumar Gaddipati struct input_dev *in_dev;
4114b6253faSDmitry Torokhov struct input_absinfo *info;
4124b6253faSDmitry Torokhov u32 max_x = 0, max_y = 0;
413*2bdb1a9aSKrzysztof Kozlowski struct device *dev = &client->dev;
4144780c8dfSNaveen Kumar Gaddipati int error;
4154780c8dfSNaveen Kumar Gaddipati
4164780c8dfSNaveen Kumar Gaddipati if (!i2c_check_functionality(client->adapter,
4174780c8dfSNaveen Kumar Gaddipati I2C_FUNC_SMBUS_BYTE_DATA)) {
418*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "i2c smbus byte data not supported\n");
4194780c8dfSNaveen Kumar Gaddipati return -EIO;
4204780c8dfSNaveen Kumar Gaddipati }
4214780c8dfSNaveen Kumar Gaddipati
422db3e34d4SDmitry Torokhov if (!client->irq) {
423*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "No IRQ set up\n");
424db3e34d4SDmitry Torokhov return -EINVAL;
425db3e34d4SDmitry Torokhov }
426db3e34d4SDmitry Torokhov
427*2bdb1a9aSKrzysztof Kozlowski ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
428caeb1aaeSDmitry Torokhov if (!ts)
429caeb1aaeSDmitry Torokhov return -ENOMEM;
4304780c8dfSNaveen Kumar Gaddipati
431a866781eSDmitry Torokhov ts->client = client;
43281e78deaSNaveen Kumar Gaddipati
433*2bdb1a9aSKrzysztof Kozlowski ts->x_flip = device_property_read_bool(dev, "rohm,flip-x");
434*2bdb1a9aSKrzysztof Kozlowski ts->y_flip = device_property_read_bool(dev, "rohm,flip-y");
4351eb7b4caSDmitry Torokhov
436*2bdb1a9aSKrzysztof Kozlowski in_dev = devm_input_allocate_device(dev);
437caeb1aaeSDmitry Torokhov if (!in_dev) {
438*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "device memory alloc failed\n");
439caeb1aaeSDmitry Torokhov return -ENOMEM;
44081e78deaSNaveen Kumar Gaddipati }
441caeb1aaeSDmitry Torokhov ts->in_dev = in_dev;
442307ec663SDmitry Torokhov input_set_drvdata(in_dev, ts);
4434780c8dfSNaveen Kumar Gaddipati
4444780c8dfSNaveen Kumar Gaddipati /* register the device to input subsystem */
4454780c8dfSNaveen Kumar Gaddipati in_dev->name = DRIVER_TP;
4464780c8dfSNaveen Kumar Gaddipati in_dev->id.bustype = BUS_I2C;
4474780c8dfSNaveen Kumar Gaddipati
448*2bdb1a9aSKrzysztof Kozlowski device_property_read_u32(dev, "rohm,touch-max-x", &max_x);
449*2bdb1a9aSKrzysztof Kozlowski device_property_read_u32(dev, "rohm,touch-max-y", &max_y);
4504b6253faSDmitry Torokhov
4514b6253faSDmitry Torokhov input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0);
4524b6253faSDmitry Torokhov input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
4534b6253faSDmitry Torokhov
4544b6253faSDmitry Torokhov touchscreen_parse_properties(in_dev, true, &ts->props);
4554b6253faSDmitry Torokhov
4564b6253faSDmitry Torokhov /* Adjust for the legacy "flip" properties, if present */
4574b6253faSDmitry Torokhov if (!ts->props.invert_x &&
458*2bdb1a9aSKrzysztof Kozlowski device_property_read_bool(dev, "rohm,flip-x")) {
4594b6253faSDmitry Torokhov info = &in_dev->absinfo[ABS_MT_POSITION_X];
4604b6253faSDmitry Torokhov info->maximum -= info->minimum;
4614b6253faSDmitry Torokhov info->minimum = 0;
4624b6253faSDmitry Torokhov }
4634b6253faSDmitry Torokhov
4644b6253faSDmitry Torokhov if (!ts->props.invert_y &&
465*2bdb1a9aSKrzysztof Kozlowski device_property_read_bool(dev, "rohm,flip-y")) {
4664b6253faSDmitry Torokhov info = &in_dev->absinfo[ABS_MT_POSITION_Y];
4674b6253faSDmitry Torokhov info->maximum -= info->minimum;
4684b6253faSDmitry Torokhov info->minimum = 0;
4694b6253faSDmitry Torokhov }
470307ec663SDmitry Torokhov
471307ec663SDmitry Torokhov error = input_mt_init_slots(in_dev, MAX_FINGERS,
472307ec663SDmitry Torokhov INPUT_MT_DIRECT | INPUT_MT_TRACK |
473307ec663SDmitry Torokhov INPUT_MT_DROP_UNUSED);
474307ec663SDmitry Torokhov if (error) {
475*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "failed to initialize MT slots");
476307ec663SDmitry Torokhov return error;
477307ec663SDmitry Torokhov }
4784780c8dfSNaveen Kumar Gaddipati
479*2bdb1a9aSKrzysztof Kozlowski ts->regulator = devm_regulator_get(dev, "avdd");
480caeb1aaeSDmitry Torokhov if (IS_ERR(ts->regulator)) {
481*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "regulator_get failed\n");
482caeb1aaeSDmitry Torokhov return PTR_ERR(ts->regulator);
483caeb1aaeSDmitry Torokhov }
484caeb1aaeSDmitry Torokhov
485caeb1aaeSDmitry Torokhov error = regulator_enable(ts->regulator);
486caeb1aaeSDmitry Torokhov if (error) {
487*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "regulator enable failed\n");
488caeb1aaeSDmitry Torokhov return error;
489caeb1aaeSDmitry Torokhov }
490caeb1aaeSDmitry Torokhov
491*2bdb1a9aSKrzysztof Kozlowski error = devm_add_action_or_reset(dev, bu21013_power_off, ts);
492caeb1aaeSDmitry Torokhov if (error) {
493*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "failed to install power off handler\n");
494caeb1aaeSDmitry Torokhov return error;
495caeb1aaeSDmitry Torokhov }
496caeb1aaeSDmitry Torokhov
497caeb1aaeSDmitry Torokhov /* Named "CS" on the chip, DT binding is "reset" */
498*2bdb1a9aSKrzysztof Kozlowski ts->cs_gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
4992886c5b9SKrzysztof Kozlowski if (IS_ERR(ts->cs_gpiod))
500*2bdb1a9aSKrzysztof Kozlowski return dev_err_probe(dev, PTR_ERR(ts->cs_gpiod), "failed to get CS GPIO\n");
5012886c5b9SKrzysztof Kozlowski
502caeb1aaeSDmitry Torokhov gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS");
503caeb1aaeSDmitry Torokhov
504*2bdb1a9aSKrzysztof Kozlowski error = devm_add_action_or_reset(dev, bu21013_disable_chip, ts);
505caeb1aaeSDmitry Torokhov if (error) {
506*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "failed to install chip disable handler\n");
507caeb1aaeSDmitry Torokhov return error;
508caeb1aaeSDmitry Torokhov }
509caeb1aaeSDmitry Torokhov
510caeb1aaeSDmitry Torokhov /* Named "INT" on the chip, DT binding is "touch" */
511*2bdb1a9aSKrzysztof Kozlowski ts->int_gpiod = devm_gpiod_get_optional(dev, "touch", GPIOD_IN);
512caeb1aaeSDmitry Torokhov error = PTR_ERR_OR_ZERO(ts->int_gpiod);
5132886c5b9SKrzysztof Kozlowski if (error)
514*2bdb1a9aSKrzysztof Kozlowski return dev_err_probe(dev, error, "failed to get INT GPIO\n");
515db3e34d4SDmitry Torokhov
516db3e34d4SDmitry Torokhov if (ts->int_gpiod)
517caeb1aaeSDmitry Torokhov gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT");
518caeb1aaeSDmitry Torokhov
519caeb1aaeSDmitry Torokhov /* configure the touch panel controller */
520caeb1aaeSDmitry Torokhov error = bu21013_init_chip(ts);
521caeb1aaeSDmitry Torokhov if (error) {
522*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "error in bu21013 config\n");
523caeb1aaeSDmitry Torokhov return error;
524caeb1aaeSDmitry Torokhov }
525caeb1aaeSDmitry Torokhov
526*2bdb1a9aSKrzysztof Kozlowski error = devm_request_threaded_irq(dev, client->irq, NULL, bu21013_gpio_irq,
527db3e34d4SDmitry Torokhov IRQF_ONESHOT, DRIVER_TP, ts);
5284780c8dfSNaveen Kumar Gaddipati if (error) {
529*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "request irq %d failed\n", client->irq);
530caeb1aaeSDmitry Torokhov return error;
5314780c8dfSNaveen Kumar Gaddipati }
5324780c8dfSNaveen Kumar Gaddipati
5334780c8dfSNaveen Kumar Gaddipati error = input_register_device(in_dev);
5344780c8dfSNaveen Kumar Gaddipati if (error) {
535*2bdb1a9aSKrzysztof Kozlowski dev_err(dev, "failed to register input device\n");
536caeb1aaeSDmitry Torokhov return error;
5374780c8dfSNaveen Kumar Gaddipati }
5384780c8dfSNaveen Kumar Gaddipati
539a866781eSDmitry Torokhov i2c_set_clientdata(client, ts);
5404780c8dfSNaveen Kumar Gaddipati
5414780c8dfSNaveen Kumar Gaddipati return 0;
5424780c8dfSNaveen Kumar Gaddipati }
543a5ee351dSDmitry Torokhov
bu21013_remove(struct i2c_client * client)544ed5c2f5fSUwe Kleine-König static void bu21013_remove(struct i2c_client *client)
5454780c8dfSNaveen Kumar Gaddipati {
546a866781eSDmitry Torokhov struct bu21013_ts *ts = i2c_get_clientdata(client);
5474780c8dfSNaveen Kumar Gaddipati
548caeb1aaeSDmitry Torokhov /* Make sure IRQ will exit quickly even if there is contact */
549caeb1aaeSDmitry Torokhov ts->touch_stopped = true;
550caeb1aaeSDmitry Torokhov /* The resources will be freed by devm */
5514780c8dfSNaveen Kumar Gaddipati }
5524780c8dfSNaveen Kumar Gaddipati
bu21013_suspend(struct device * dev)553bed5cf8fSJonathan Cameron static int bu21013_suspend(struct device *dev)
5544780c8dfSNaveen Kumar Gaddipati {
55518aa4d6bSDmitry Torokhov struct i2c_client *client = to_i2c_client(dev);
55618aa4d6bSDmitry Torokhov struct bu21013_ts *ts = i2c_get_clientdata(client);
5574780c8dfSNaveen Kumar Gaddipati
558a866781eSDmitry Torokhov ts->touch_stopped = true;
55918aa4d6bSDmitry Torokhov mb();
560db3e34d4SDmitry Torokhov disable_irq(client->irq);
5614780c8dfSNaveen Kumar Gaddipati
56218aa4d6bSDmitry Torokhov if (!device_may_wakeup(&client->dev))
563a866781eSDmitry Torokhov regulator_disable(ts->regulator);
56481e78deaSNaveen Kumar Gaddipati
5654780c8dfSNaveen Kumar Gaddipati return 0;
5664780c8dfSNaveen Kumar Gaddipati }
5674780c8dfSNaveen Kumar Gaddipati
bu21013_resume(struct device * dev)568bed5cf8fSJonathan Cameron static int bu21013_resume(struct device *dev)
5694780c8dfSNaveen Kumar Gaddipati {
57018aa4d6bSDmitry Torokhov struct i2c_client *client = to_i2c_client(dev);
57118aa4d6bSDmitry Torokhov struct bu21013_ts *ts = i2c_get_clientdata(client);
57218aa4d6bSDmitry Torokhov int error;
5734780c8dfSNaveen Kumar Gaddipati
57418aa4d6bSDmitry Torokhov if (!device_may_wakeup(&client->dev)) {
57518aa4d6bSDmitry Torokhov error = regulator_enable(ts->regulator);
57618aa4d6bSDmitry Torokhov if (error) {
57718aa4d6bSDmitry Torokhov dev_err(&client->dev,
57818aa4d6bSDmitry Torokhov "failed to re-enable regulator when resuming\n");
57918aa4d6bSDmitry Torokhov return error;
58081e78deaSNaveen Kumar Gaddipati }
58181e78deaSNaveen Kumar Gaddipati
58218aa4d6bSDmitry Torokhov error = bu21013_init_chip(ts);
58318aa4d6bSDmitry Torokhov if (error) {
58418aa4d6bSDmitry Torokhov dev_err(&client->dev,
58518aa4d6bSDmitry Torokhov "failed to reinitialize chip when resuming\n");
58618aa4d6bSDmitry Torokhov return error;
58718aa4d6bSDmitry Torokhov }
5884780c8dfSNaveen Kumar Gaddipati }
5894780c8dfSNaveen Kumar Gaddipati
590a866781eSDmitry Torokhov ts->touch_stopped = false;
59118aa4d6bSDmitry Torokhov mb();
592db3e34d4SDmitry Torokhov enable_irq(client->irq);
5934780c8dfSNaveen Kumar Gaddipati
5944780c8dfSNaveen Kumar Gaddipati return 0;
5954780c8dfSNaveen Kumar Gaddipati }
5964780c8dfSNaveen Kumar Gaddipati
597bed5cf8fSJonathan Cameron static DEFINE_SIMPLE_DEV_PM_OPS(bu21013_dev_pm_ops, bu21013_suspend, bu21013_resume);
5984780c8dfSNaveen Kumar Gaddipati
5994780c8dfSNaveen Kumar Gaddipati static const struct i2c_device_id bu21013_id[] = {
6004780c8dfSNaveen Kumar Gaddipati { DRIVER_TP, 0 },
6014780c8dfSNaveen Kumar Gaddipati { }
6024780c8dfSNaveen Kumar Gaddipati };
6034780c8dfSNaveen Kumar Gaddipati MODULE_DEVICE_TABLE(i2c, bu21013_id);
6044780c8dfSNaveen Kumar Gaddipati
6054780c8dfSNaveen Kumar Gaddipati static struct i2c_driver bu21013_driver = {
6064780c8dfSNaveen Kumar Gaddipati .driver = {
6074780c8dfSNaveen Kumar Gaddipati .name = DRIVER_TP,
608bed5cf8fSJonathan Cameron .pm = pm_sleep_ptr(&bu21013_dev_pm_ops),
6094780c8dfSNaveen Kumar Gaddipati },
610d8bde56dSUwe Kleine-König .probe = bu21013_probe,
6111cb0aa88SBill Pemberton .remove = bu21013_remove,
6124780c8dfSNaveen Kumar Gaddipati .id_table = bu21013_id,
6134780c8dfSNaveen Kumar Gaddipati };
6144780c8dfSNaveen Kumar Gaddipati
6151b92c1cfSAxel Lin module_i2c_driver(bu21013_driver);
6164780c8dfSNaveen Kumar Gaddipati
6174780c8dfSNaveen Kumar Gaddipati MODULE_LICENSE("GPL v2");
6184780c8dfSNaveen Kumar Gaddipati MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>");
6194780c8dfSNaveen Kumar Gaddipati MODULE_DESCRIPTION("bu21013 touch screen controller driver");
620