Input: add support for ROHM BU21023/24 touchscreen
This adds support for ROHM BU21023/24 Dual touch resistive touchscreens.
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/touchscreen/rohm_bu21023.c b/drivers/input/touchscreen/rohm_bu21023.c
new file mode 100644
index 0000000..ba6024f
--- /dev/null
+++ b/drivers/input/touchscreen/rohm_bu21023.c
@@ -0,0 +1,1218 @@
+/*
+ * ROHM BU21023/24 Dual touch support resistive touch screen driver
+ * Copyright (C) 2012 ROHM CO.,LTD.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/delay.h>
+#include <linux/firmware.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>
+
+#define BU21023_NAME "bu21023_ts"
+#define BU21023_FIRMWARE_NAME "bu21023.bin"
+
+#define MAX_CONTACTS 2
+
+#define AXIS_ADJUST 4
+#define AXIS_OFFSET 8
+
+#define FIRMWARE_BLOCK_SIZE 32U
+#define FIRMWARE_RETRY_MAX 4
+
+#define SAMPLING_DELAY 12 /* msec */
+
+#define CALIBRATION_RETRY_MAX 6
+
+#define ROHM_TS_ABS_X_MIN 40
+#define ROHM_TS_ABS_X_MAX 990
+#define ROHM_TS_ABS_Y_MIN 160
+#define ROHM_TS_ABS_Y_MAX 920
+#define ROHM_TS_DISPLACEMENT_MAX 0 /* zero for infinite */
+
+/*
+ * BU21023GUL/BU21023MUV/BU21024FV-M registers map
+ */
+#define VADOUT_YP_H 0x00
+#define VADOUT_YP_L 0x01
+#define VADOUT_XP_H 0x02
+#define VADOUT_XP_L 0x03
+#define VADOUT_YN_H 0x04
+#define VADOUT_YN_L 0x05
+#define VADOUT_XN_H 0x06
+#define VADOUT_XN_L 0x07
+
+#define PRM1_X_H 0x08
+#define PRM1_X_L 0x09
+#define PRM1_Y_H 0x0a
+#define PRM1_Y_L 0x0b
+#define PRM2_X_H 0x0c
+#define PRM2_X_L 0x0d
+#define PRM2_Y_H 0x0e
+#define PRM2_Y_L 0x0f
+
+#define MLT_PRM_MONI_X 0x10
+#define MLT_PRM_MONI_Y 0x11
+
+#define DEBUG_MONI_1 0x12
+#define DEBUG_MONI_2 0x13
+
+#define VADOUT_ZX_H 0x14
+#define VADOUT_ZX_L 0x15
+#define VADOUT_ZY_H 0x16
+#define VADOUT_ZY_L 0x17
+
+#define Z_PARAM_H 0x18
+#define Z_PARAM_L 0x19
+
+/*
+ * Value for VADOUT_*_L
+ */
+#define VADOUT_L_MASK 0x01
+
+/*
+ * Value for PRM*_*_L
+ */
+#define PRM_L_MASK 0x01
+
+#define POS_X1_H 0x20
+#define POS_X1_L 0x21
+#define POS_Y1_H 0x22
+#define POS_Y1_L 0x23
+#define POS_X2_H 0x24
+#define POS_X2_L 0x25
+#define POS_Y2_H 0x26
+#define POS_Y2_L 0x27
+
+/*
+ * Value for POS_*_L
+ */
+#define POS_L_MASK 0x01
+
+#define TOUCH 0x28
+#define TOUCH_DETECT 0x01
+
+#define TOUCH_GESTURE 0x29
+#define SINGLE_TOUCH 0x01
+#define DUAL_TOUCH 0x03
+#define TOUCH_MASK 0x03
+#define CALIBRATION_REQUEST 0x04
+#define CALIBRATION_STATUS 0x08
+#define CALIBRATION_MASK 0x0c
+#define GESTURE_SPREAD 0x10
+#define GESTURE_PINCH 0x20
+#define GESTURE_ROTATE_R 0x40
+#define GESTURE_ROTATE_L 0x80
+
+#define INT_STATUS 0x2a
+#define INT_MASK 0x3d
+#define INT_CLEAR 0x3e
+
+/*
+ * Values for INT_*
+ */
+#define COORD_UPDATE 0x01
+#define CALIBRATION_DONE 0x02
+#define SLEEP_IN 0x04
+#define SLEEP_OUT 0x08
+#define PROGRAM_LOAD_DONE 0x10
+#define ERROR 0x80
+#define INT_ALL 0x9f
+
+#define ERR_STATUS 0x2b
+#define ERR_MASK 0x3f
+
+/*
+ * Values for ERR_*
+ */
+#define ADC_TIMEOUT 0x01
+#define CPU_TIMEOUT 0x02
+#define CALIBRATION_ERR 0x04
+#define PROGRAM_LOAD_ERR 0x10
+
+#define COMMON_SETUP1 0x30
+#define PROGRAM_LOAD_HOST 0x02
+#define PROGRAM_LOAD_EEPROM 0x03
+#define CENSOR_4PORT 0x04
+#define CENSOR_8PORT 0x00 /* Not supported by BU21023 */
+#define CALIBRATION_TYPE_DEFAULT 0x08
+#define CALIBRATION_TYPE_SPECIAL 0x00
+#define INT_ACTIVE_HIGH 0x10
+#define INT_ACTIVE_LOW 0x00
+#define AUTO_CALIBRATION 0x40
+#define MANUAL_CALIBRATION 0x00
+#define COMMON_SETUP1_DEFAULT 0x4e
+
+#define COMMON_SETUP2 0x31
+#define MAF_NONE 0x00
+#define MAF_1SAMPLE 0x01
+#define MAF_3SAMPLES 0x02
+#define MAF_5SAMPLES 0x03
+#define INV_Y 0x04
+#define INV_X 0x08
+#define SWAP_XY 0x10
+
+#define COMMON_SETUP3 0x32
+#define EN_SLEEP 0x01
+#define EN_MULTI 0x02
+#define EN_GESTURE 0x04
+#define EN_INTVL 0x08
+#define SEL_STEP 0x10
+#define SEL_MULTI 0x20
+#define SEL_TBL_DEFAULT 0x40
+
+#define INTERVAL_TIME 0x33
+#define INTERVAL_TIME_DEFAULT 0x10
+
+#define STEP_X 0x34
+#define STEP_X_DEFAULT 0x41
+
+#define STEP_Y 0x35
+#define STEP_Y_DEFAULT 0x8d
+
+#define OFFSET_X 0x38
+#define OFFSET_X_DEFAULT 0x0c
+
+#define OFFSET_Y 0x39
+#define OFFSET_Y_DEFAULT 0x0c
+
+#define THRESHOLD_TOUCH 0x3a
+#define THRESHOLD_TOUCH_DEFAULT 0xa0
+
+#define THRESHOLD_GESTURE 0x3b
+#define THRESHOLD_GESTURE_DEFAULT 0x17
+
+#define SYSTEM 0x40
+#define ANALOG_POWER_ON 0x01
+#define ANALOG_POWER_OFF 0x00
+#define CPU_POWER_ON 0x02
+#define CPU_POWER_OFF 0x00
+
+#define FORCE_CALIBRATION 0x42
+#define FORCE_CALIBRATION_ON 0x01
+#define FORCE_CALIBRATION_OFF 0x00
+
+#define CPU_FREQ 0x50 /* 10 / (reg + 1) MHz */
+#define CPU_FREQ_10MHZ 0x00
+#define CPU_FREQ_5MHZ 0x01
+#define CPU_FREQ_1MHZ 0x09
+
+#define EEPROM_ADDR 0x51
+
+#define CALIBRATION_ADJUST 0x52
+#define CALIBRATION_ADJUST_DEFAULT 0x00
+
+#define THRESHOLD_SLEEP_IN 0x53
+
+#define EVR_XY 0x56
+#define EVR_XY_DEFAULT 0x10
+
+#define PRM_SWOFF_TIME 0x57
+#define PRM_SWOFF_TIME_DEFAULT 0x04
+
+#define PROGRAM_VERSION 0x5f
+
+#define ADC_CTRL 0x60
+#define ADC_DIV_MASK 0x1f /* The minimum value is 4 */
+#define ADC_DIV_DEFAULT 0x08
+
+#define ADC_WAIT 0x61
+#define ADC_WAIT_DEFAULT 0x0a
+
+#define SWCONT 0x62
+#define SWCONT_DEFAULT 0x0f
+
+#define EVR_X 0x63
+#define EVR_X_DEFAULT 0x86
+
+#define EVR_Y 0x64
+#define EVR_Y_DEFAULT 0x64
+
+#define TEST1 0x65
+#define DUALTOUCH_STABILIZE_ON 0x01
+#define DUALTOUCH_STABILIZE_OFF 0x00
+#define DUALTOUCH_REG_ON 0x20
+#define DUALTOUCH_REG_OFF 0x00
+
+#define CALIBRATION_REG1 0x68
+#define CALIBRATION_REG1_DEFAULT 0xd9
+
+#define CALIBRATION_REG2 0x69
+#define CALIBRATION_REG2_DEFAULT 0x36
+
+#define CALIBRATION_REG3 0x6a
+#define CALIBRATION_REG3_DEFAULT 0x32
+
+#define EX_ADDR_H 0x70
+#define EX_ADDR_L 0x71
+#define EX_WDAT 0x72
+#define EX_RDAT 0x73
+#define EX_CHK_SUM1 0x74
+#define EX_CHK_SUM2 0x75
+#define EX_CHK_SUM3 0x76
+
+struct rohm_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+
+ bool initialized;
+
+ unsigned int contact_count[MAX_CONTACTS + 1];
+ int finger_count;
+
+ u8 setup2;
+};
+
+/*
+ * rohm_i2c_burst_read - execute combined I2C message for ROHM BU21023/24
+ * @client: Handle to ROHM BU21023/24
+ * @start: Where to start read address from ROHM BU21023/24
+ * @buf: Where to store read data from ROHM BU21023/24
+ * @len: How many bytes to read
+ *
+ * Returns negative errno, else zero on success.
+ *
+ * Note
+ * In BU21023/24 burst read, stop condition is needed after "address write".
+ * Therefore, transmission is performed in 2 steps.
+ */
+static int rohm_i2c_burst_read(struct i2c_client *client, u8 start, void *buf,
+ size_t len)
+{
+ struct i2c_adapter *adap = client->adapter;
+ struct i2c_msg msg[2];
+ int i, ret = 0;
+
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].len = 1;
+ msg[0].buf = &start;
+
+ msg[1].addr = client->addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].len = len;
+ msg[1].buf = buf;
+
+ i2c_lock_adapter(adap);
+
+ for (i = 0; i < 2; i++) {
+ if (__i2c_transfer(adap, &msg[i], 1) < 0) {
+ ret = -EIO;
+ break;
+ }
+ }
+
+ i2c_unlock_adapter(adap);
+
+ return ret;
+}
+
+static int rohm_ts_manual_calibration(struct rohm_ts_data *ts)
+{
+ struct i2c_client *client = ts->client;
+ struct device *dev = &client->dev;
+ u8 buf[33]; /* for PRM1_X_H(0x08)-TOUCH(0x28) */
+
+ int retry;
+ bool success = false;
+ bool first_time = true;
+ bool calibration_done;
+
+ u8 reg1, reg2, reg3;
+ s32 reg1_orig, reg2_orig, reg3_orig;
+ s32 val;
+
+ int calib_x = 0, calib_y = 0;
+ int reg_x, reg_y;
+ int err_x, err_y;
+
+ int error, error2;
+ int i;
+
+ reg1_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG1);
+ if (reg1_orig < 0)
+ return reg1_orig;
+
+ reg2_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG2);
+ if (reg2_orig < 0)
+ return reg2_orig;
+
+ reg3_orig = i2c_smbus_read_byte_data(client, CALIBRATION_REG3);
+ if (reg3_orig < 0)
+ return reg3_orig;
+
+ error = i2c_smbus_write_byte_data(client, INT_MASK,
+ COORD_UPDATE | SLEEP_IN | SLEEP_OUT |
+ PROGRAM_LOAD_DONE);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client, TEST1,
+ DUALTOUCH_STABILIZE_ON);
+ if (error)
+ goto out;
+
+ for (retry = 0; retry < CALIBRATION_RETRY_MAX; retry++) {
+ /* wait 2 sampling for update */
+ mdelay(2 * SAMPLING_DELAY);
+
+#define READ_CALIB_BUF(reg) buf[((reg) - PRM1_X_H)]
+
+ error = rohm_i2c_burst_read(client, PRM1_X_H, buf, sizeof(buf));
+ if (error)
+ goto out;
+
+ if (READ_CALIB_BUF(TOUCH) & TOUCH_DETECT)
+ continue;
+
+ if (first_time) {
+ /* generate calibration parameter */
+ calib_x = ((int)READ_CALIB_BUF(PRM1_X_H) << 2 |
+ READ_CALIB_BUF(PRM1_X_L)) - AXIS_OFFSET;
+ calib_y = ((int)READ_CALIB_BUF(PRM1_Y_H) << 2 |
+ READ_CALIB_BUF(PRM1_Y_L)) - AXIS_OFFSET;
+
+ error = i2c_smbus_write_byte_data(client, TEST1,
+ DUALTOUCH_STABILIZE_ON | DUALTOUCH_REG_ON);
+ if (error)
+ goto out;
+
+ first_time = false;
+ } else {
+ /* generate adjustment parameter */
+ err_x = (int)READ_CALIB_BUF(PRM1_X_H) << 2 |
+ READ_CALIB_BUF(PRM1_X_L);
+ err_y = (int)READ_CALIB_BUF(PRM1_Y_H) << 2 |
+ READ_CALIB_BUF(PRM1_Y_L);
+
+ /* X axis ajust */
+ if (err_x <= 4)
+ calib_x -= AXIS_ADJUST;
+ else if (err_x >= 60)
+ calib_x += AXIS_ADJUST;
+
+ /* Y axis ajust */
+ if (err_y <= 4)
+ calib_y -= AXIS_ADJUST;
+ else if (err_y >= 60)
+ calib_y += AXIS_ADJUST;
+ }
+
+ /* generate calibration setting value */
+ reg_x = calib_x + ((calib_x & 0x200) << 1);
+ reg_y = calib_y + ((calib_y & 0x200) << 1);
+
+ /* convert for register format */
+ reg1 = reg_x >> 3;
+ reg2 = (reg_y & 0x7) << 4 | (reg_x & 0x7);
+ reg3 = reg_y >> 3;
+
+ error = i2c_smbus_write_byte_data(client,
+ CALIBRATION_REG1, reg1);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client,
+ CALIBRATION_REG2, reg2);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client,
+ CALIBRATION_REG3, reg3);
+ if (error)
+ goto out;
+
+ /*
+ * force calibration sequcence
+ */
+ error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_OFF);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_ON);
+ if (error)
+ goto out;
+
+ /* clear all interrupts */
+ error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (error)
+ goto out;
+
+ /*
+ * Wait for the status change of calibration, max 10 sampling
+ */
+ calibration_done = false;
+
+ for (i = 0; i < 10; i++) {
+ mdelay(SAMPLING_DELAY);
+
+ val = i2c_smbus_read_byte_data(client, TOUCH_GESTURE);
+ if (!(val & CALIBRATION_MASK)) {
+ calibration_done = true;
+ break;
+ } else if (val < 0) {
+ error = val;
+ goto out;
+ }
+ }
+
+ if (calibration_done) {
+ val = i2c_smbus_read_byte_data(client, INT_STATUS);
+ if (val == CALIBRATION_DONE) {
+ success = true;
+ break;
+ } else if (val < 0) {
+ error = val;
+ goto out;
+ }
+ } else {
+ dev_warn(dev, "calibration timeout\n");
+ }
+ }
+
+ if (!success) {
+ error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
+ reg1_orig);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
+ reg2_orig);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
+ reg3_orig);
+ if (error)
+ goto out;
+
+ /* calibration data enable */
+ error = i2c_smbus_write_byte_data(client, TEST1,
+ DUALTOUCH_STABILIZE_ON |
+ DUALTOUCH_REG_ON);
+ if (error)
+ goto out;
+
+ /* wait 10 sampling */
+ mdelay(10 * SAMPLING_DELAY);
+
+ error = -EBUSY;
+ }
+
+out:
+ error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
+ if (!error2)
+ /* Clear all interrupts */
+ error2 = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+
+ return error ? error : error2;
+}
+
+static const unsigned int untouch_threshold[3] = { 0, 1, 5 };
+static const unsigned int single_touch_threshold[3] = { 0, 0, 4 };
+static const unsigned int dual_touch_threshold[3] = { 10, 8, 0 };
+
+static irqreturn_t rohm_ts_soft_irq(int irq, void *dev_id)
+{
+ struct rohm_ts_data *ts = dev_id;
+ struct i2c_client *client = ts->client;
+ struct input_dev *input_dev = ts->input;
+ struct device *dev = &client->dev;
+
+ u8 buf[10]; /* for POS_X1_H(0x20)-TOUCH_GESTURE(0x29) */
+
+ struct input_mt_pos pos[MAX_CONTACTS];
+ int slots[MAX_CONTACTS];
+ u8 touch_flags;
+ unsigned int threshold;
+ int finger_count = -1;
+ int prev_finger_count = ts->finger_count;
+ int count;
+ int error;
+ int i;
+
+ error = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
+ if (error)
+ return IRQ_HANDLED;
+
+ /* Clear all interrupts */
+ error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (error)
+ return IRQ_HANDLED;
+
+#define READ_POS_BUF(reg) buf[((reg) - POS_X1_H)]
+
+ error = rohm_i2c_burst_read(client, POS_X1_H, buf, sizeof(buf));
+ if (error)
+ return IRQ_HANDLED;
+
+ touch_flags = READ_POS_BUF(TOUCH_GESTURE) & TOUCH_MASK;
+ if (touch_flags) {
+ /* generate coordinates */
+ pos[0].x = ((s16)READ_POS_BUF(POS_X1_H) << 2) |
+ READ_POS_BUF(POS_X1_L);
+ pos[0].y = ((s16)READ_POS_BUF(POS_Y1_H) << 2) |
+ READ_POS_BUF(POS_Y1_L);
+ pos[1].x = ((s16)READ_POS_BUF(POS_X2_H) << 2) |
+ READ_POS_BUF(POS_X2_L);
+ pos[1].y = ((s16)READ_POS_BUF(POS_Y2_H) << 2) |
+ READ_POS_BUF(POS_Y2_L);
+ }
+
+ switch (touch_flags) {
+ case 0:
+ threshold = untouch_threshold[prev_finger_count];
+ if (++ts->contact_count[0] >= threshold)
+ finger_count = 0;
+ break;
+
+ case SINGLE_TOUCH:
+ threshold = single_touch_threshold[prev_finger_count];
+ if (++ts->contact_count[1] >= threshold)
+ finger_count = 1;
+
+ if (finger_count == 1) {
+ if (pos[1].x != 0 && pos[1].y != 0) {
+ pos[0].x = pos[1].x;
+ pos[0].y = pos[1].y;
+ pos[1].x = 0;
+ pos[1].y = 0;
+ }
+ }
+ break;
+
+ case DUAL_TOUCH:
+ threshold = dual_touch_threshold[prev_finger_count];
+ if (++ts->contact_count[2] >= threshold)
+ finger_count = 2;
+ break;
+
+ default:
+ dev_dbg(dev,
+ "Three or more touches are not supported\n");
+ return IRQ_HANDLED;
+ }
+
+ if (finger_count >= 0) {
+ if (prev_finger_count != finger_count) {
+ count = ts->contact_count[finger_count];
+ memset(ts->contact_count, 0, sizeof(ts->contact_count));
+ ts->contact_count[finger_count] = count;
+ }
+
+ input_mt_assign_slots(input_dev, slots, pos,
+ finger_count, ROHM_TS_DISPLACEMENT_MAX);
+
+ for (i = 0; i < finger_count; i++) {
+ input_mt_slot(input_dev, slots[i]);
+ input_mt_report_slot_state(input_dev,
+ MT_TOOL_FINGER, true);
+ input_report_abs(input_dev,
+ ABS_MT_POSITION_X, pos[i].x);
+ input_report_abs(input_dev,
+ ABS_MT_POSITION_Y, pos[i].y);
+ }
+
+ input_mt_sync_frame(input_dev);
+ input_mt_report_pointer_emulation(input_dev, true);
+ input_sync(input_dev);
+
+ ts->finger_count = finger_count;
+ }
+
+ if (READ_POS_BUF(TOUCH_GESTURE) & CALIBRATION_REQUEST) {
+ error = rohm_ts_manual_calibration(ts);
+ if (error)
+ dev_warn(dev, "manual calibration failed: %d\n",
+ error);
+ }
+
+ i2c_smbus_write_byte_data(client, INT_MASK,
+ CALIBRATION_DONE | SLEEP_OUT | SLEEP_IN |
+ PROGRAM_LOAD_DONE);
+
+ return IRQ_HANDLED;
+}
+
+static int rohm_ts_load_firmware(struct i2c_client *client,
+ const char *firmware_name)
+{
+ struct device *dev = &client->dev;
+ const struct firmware *fw;
+ s32 status;
+ unsigned int offset, len, xfer_len;
+ unsigned int retry = 0;
+ int error, error2;
+
+ error = request_firmware(&fw, firmware_name, dev);
+ if (error) {
+ dev_err(dev, "unable to retrieve firmware %s: %d\n",
+ firmware_name, error);
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, INT_MASK,
+ COORD_UPDATE | CALIBRATION_DONE |
+ SLEEP_IN | SLEEP_OUT);
+ if (error)
+ goto out;
+
+ do {
+ if (retry) {
+ dev_warn(dev, "retrying firmware load\n");
+
+ /* settings for retry */
+ error = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
+ if (error)
+ goto out;
+ }
+
+ error = i2c_smbus_write_byte_data(client, EX_ADDR_H, 0);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client, EX_ADDR_L, 0);
+ if (error)
+ goto out;
+
+ error = i2c_smbus_write_byte_data(client, COMMON_SETUP1,
+ COMMON_SETUP1_DEFAULT);
+ if (error)
+ goto out;
+
+ /* firmware load to the device */
+ offset = 0;
+ len = fw->size;
+
+ while (len) {
+ xfer_len = min(FIRMWARE_BLOCK_SIZE, len);
+
+ error = i2c_smbus_write_i2c_block_data(client, EX_WDAT,
+ xfer_len, &fw->data[offset]);
+ if (error)
+ goto out;
+
+ len -= xfer_len;
+ offset += xfer_len;
+ }
+
+ /* check firmware load result */
+ status = i2c_smbus_read_byte_data(client, INT_STATUS);
+ if (status < 0) {
+ error = status;
+ goto out;
+ }
+
+ /* clear all interrupts */
+ error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (error)
+ goto out;
+
+ if (status == PROGRAM_LOAD_DONE)
+ break;
+
+ error = -EIO;
+ } while (++retry >= FIRMWARE_RETRY_MAX);
+
+out:
+ error2 = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
+
+ release_firmware(fw);
+
+ return error ? error : error2;
+}
+
+static ssize_t swap_xy_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rohm_ts_data *ts = i2c_get_clientdata(client);
+
+ return sprintf(buf, "%d\n", !!(ts->setup2 & SWAP_XY));
+}
+
+static ssize_t swap_xy_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rohm_ts_data *ts = i2c_get_clientdata(client);
+ unsigned int val;
+ int error;
+
+ error = kstrtouint(buf, 0, &val);
+ if (error)
+ return error;
+
+ error = mutex_lock_interruptible(&ts->input->mutex);
+ if (error)
+ return error;
+
+ if (val)
+ ts->setup2 |= SWAP_XY;
+ else
+ ts->setup2 &= ~SWAP_XY;
+
+ if (ts->initialized)
+ error = i2c_smbus_write_byte_data(ts->client, COMMON_SETUP2,
+ ts->setup2);
+
+ mutex_unlock(&ts->input->mutex);
+
+ return error ? error : count;
+}
+
+static ssize_t inv_x_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rohm_ts_data *ts = i2c_get_clientdata(client);
+
+ return sprintf(buf, "%d\n", !!(ts->setup2 & INV_X));
+}
+
+static ssize_t inv_x_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rohm_ts_data *ts = i2c_get_clientdata(client);
+ unsigned int val;
+ int error;
+
+ error = kstrtouint(buf, 0, &val);
+ if (error)
+ return error;
+
+ error = mutex_lock_interruptible(&ts->input->mutex);
+ if (error)
+ return error;
+
+ if (val)
+ ts->setup2 |= INV_X;
+ else
+ ts->setup2 &= ~INV_X;
+
+ if (ts->initialized)
+ error = i2c_smbus_write_byte_data(ts->client, COMMON_SETUP2,
+ ts->setup2);
+
+ mutex_unlock(&ts->input->mutex);
+
+ return error ? error : count;
+}
+
+static ssize_t inv_y_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rohm_ts_data *ts = i2c_get_clientdata(client);
+
+ return sprintf(buf, "%d\n", !!(ts->setup2 & INV_Y));
+}
+
+static ssize_t inv_y_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct rohm_ts_data *ts = i2c_get_clientdata(client);
+ unsigned int val;
+ int error;
+
+ error = kstrtouint(buf, 0, &val);
+ if (error)
+ return error;
+
+ error = mutex_lock_interruptible(&ts->input->mutex);
+ if (error)
+ return error;
+
+ if (val)
+ ts->setup2 |= INV_Y;
+ else
+ ts->setup2 &= ~INV_Y;
+
+ if (ts->initialized)
+ error = i2c_smbus_write_byte_data(client, COMMON_SETUP2,
+ ts->setup2);
+
+ mutex_unlock(&ts->input->mutex);
+
+ return error ? error : count;
+}
+
+static DEVICE_ATTR_RW(swap_xy);
+static DEVICE_ATTR_RW(inv_x);
+static DEVICE_ATTR_RW(inv_y);
+
+static struct attribute *rohm_ts_attrs[] = {
+ &dev_attr_swap_xy.attr,
+ &dev_attr_inv_x.attr,
+ &dev_attr_inv_y.attr,
+ NULL,
+};
+
+static const struct attribute_group rohm_ts_attr_group = {
+ .attrs = rohm_ts_attrs,
+};
+
+static int rohm_ts_device_init(struct i2c_client *client, u8 setup2)
+{
+ struct device *dev = &client->dev;
+ int error;
+
+ disable_irq(client->irq);
+
+ /*
+ * Wait 200usec for reset
+ */
+ udelay(200);
+
+ /* Release analog reset */
+ error = i2c_smbus_write_byte_data(client, SYSTEM,
+ ANALOG_POWER_ON | CPU_POWER_OFF);
+ if (error)
+ return error;
+
+ /* Waiting for the analog warm-up, max. 200usec */
+ udelay(200);
+
+ /* clear all interrupts */
+ error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, COMMON_SETUP1, 0);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, COMMON_SETUP2, setup2);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, COMMON_SETUP3,
+ SEL_TBL_DEFAULT | EN_MULTI);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, THRESHOLD_GESTURE,
+ THRESHOLD_GESTURE_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, INTERVAL_TIME,
+ INTERVAL_TIME_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, CPU_FREQ, CPU_FREQ_10MHZ);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, PRM_SWOFF_TIME,
+ PRM_SWOFF_TIME_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, ADC_CTRL, ADC_DIV_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, ADC_WAIT, ADC_WAIT_DEFAULT);
+ if (error)
+ return error;
+
+ /*
+ * Panel setup, these values change with the panel.
+ */
+ error = i2c_smbus_write_byte_data(client, STEP_X, STEP_X_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, STEP_Y, STEP_Y_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, OFFSET_X, OFFSET_X_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, OFFSET_Y, OFFSET_Y_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, THRESHOLD_TOUCH,
+ THRESHOLD_TOUCH_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, EVR_XY, EVR_XY_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, EVR_X, EVR_X_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, EVR_Y, EVR_Y_DEFAULT);
+ if (error)
+ return error;
+
+ /* Fixed value settings */
+ error = i2c_smbus_write_byte_data(client, CALIBRATION_ADJUST,
+ CALIBRATION_ADJUST_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, SWCONT, SWCONT_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, TEST1,
+ DUALTOUCH_STABILIZE_ON |
+ DUALTOUCH_REG_ON);
+ if (error)
+ return error;
+
+ error = rohm_ts_load_firmware(client, BU21023_FIRMWARE_NAME);
+ if (error) {
+ dev_err(dev, "failed to load firmware: %d\n", error);
+ return error;
+ }
+
+ /*
+ * Manual calibration results are not changed in same environment.
+ * If the force calibration is performed,
+ * the controller will not require calibration request interrupt
+ * when the typical values are set to the calibration registers.
+ */
+ error = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
+ CALIBRATION_REG1_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
+ CALIBRATION_REG2_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
+ CALIBRATION_REG3_DEFAULT);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_OFF);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_ON);
+ if (error)
+ return error;
+
+ /* Clear all interrupts */
+ error = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (error)
+ return error;
+
+ /* Enable coordinates update interrupt */
+ error = i2c_smbus_write_byte_data(client, INT_MASK,
+ CALIBRATION_DONE | SLEEP_OUT |
+ SLEEP_IN | PROGRAM_LOAD_DONE);
+ if (error)
+ return error;
+
+ error = i2c_smbus_write_byte_data(client, ERR_MASK,
+ PROGRAM_LOAD_ERR | CPU_TIMEOUT |
+ ADC_TIMEOUT);
+ if (error)
+ return error;
+
+ /* controller CPU power on */
+ error = i2c_smbus_write_byte_data(client, SYSTEM,
+ ANALOG_POWER_ON | CPU_POWER_ON);
+
+ enable_irq(client->irq);
+
+ return error;
+}
+
+static int rohm_ts_power_off(struct i2c_client *client)
+{
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, SYSTEM,
+ ANALOG_POWER_ON | CPU_POWER_OFF);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to power off device CPU: %d\n", error);
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, SYSTEM,
+ ANALOG_POWER_OFF | CPU_POWER_OFF);
+ if (error)
+ dev_err(&client->dev,
+ "failed to power off the device: %d\n", error);
+
+ return error;
+}
+
+static int rohm_ts_open(struct input_dev *input_dev)
+{
+ struct rohm_ts_data *ts = input_get_drvdata(input_dev);
+ struct i2c_client *client = ts->client;
+ int error;
+
+ if (!ts->initialized) {
+ error = rohm_ts_device_init(client, ts->setup2);
+ if (error) {
+ dev_err(&client->dev,
+ "device initialization failed: %d\n", error);
+ return error;
+ }
+
+ ts->initialized = true;
+ }
+
+ return 0;
+}
+
+static void rohm_ts_close(struct input_dev *input_dev)
+{
+ struct rohm_ts_data *ts = input_get_drvdata(input_dev);
+
+ rohm_ts_power_off(ts->client);
+
+ ts->initialized = false;
+}
+
+static void rohm_ts_remove_sysfs_group(void *_dev)
+{
+ struct device *dev = _dev;
+
+ sysfs_remove_group(&dev->kobj, &rohm_ts_attr_group);
+}
+
+static int rohm_bu21023_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct rohm_ts_data *ts;
+ struct input_dev *input;
+ int error;
+
+ if (!client->irq) {
+ dev_err(dev, "IRQ is not assigned\n");
+ return -EINVAL;
+ }
+
+ if (!client->adapter->algo->master_xfer) {
+ dev_err(dev, "I2C level transfers not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ /* Turn off CPU just in case */
+ error = rohm_ts_power_off(client);
+ if (error)
+ return error;
+
+ ts = devm_kzalloc(dev, sizeof(struct rohm_ts_data), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->client = client;
+ ts->setup2 = MAF_1SAMPLE;
+ i2c_set_clientdata(client, ts);
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = BU21023_NAME;
+ input->id.bustype = BUS_I2C;
+ input->open = rohm_ts_open;
+ input->close = rohm_ts_close;
+
+ ts->input = input;
+ input_set_drvdata(input, ts);
+
+ input_set_abs_params(input, ABS_MT_POSITION_X,
+ ROHM_TS_ABS_X_MIN, ROHM_TS_ABS_X_MAX, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y,
+ ROHM_TS_ABS_Y_MIN, ROHM_TS_ABS_Y_MAX, 0, 0);
+
+ error = input_mt_init_slots(input, MAX_CONTACTS,
+ INPUT_MT_DIRECT | INPUT_MT_TRACK |
+ INPUT_MT_DROP_UNUSED);
+ if (error) {
+ dev_err(dev, "failed to multi touch slots initialization\n");
+ return error;
+ }
+
+ error = devm_request_threaded_irq(dev, client->irq,
+ NULL, rohm_ts_soft_irq,
+ IRQF_ONESHOT, client->name, ts);
+ if (error) {
+ dev_err(dev, "failed to request IRQ: %d\n", error);
+ return error;
+ }
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(dev, "failed to register input device: %d\n", error);
+ return error;
+ }
+
+ error = sysfs_create_group(&dev->kobj, &rohm_ts_attr_group);
+ if (error) {
+ dev_err(dev, "failed to create sysfs group: %d\n", error);
+ return error;
+ }
+
+ error = devm_add_action(dev, rohm_ts_remove_sysfs_group, dev);
+ if (error) {
+ rohm_ts_remove_sysfs_group(dev);
+ dev_err(&client->dev,
+ "Failed to add sysfs cleanup action: %d\n",
+ error);
+ return error;
+ }
+
+ return error;
+}
+
+static const struct i2c_device_id rohm_bu21023_i2c_id[] = {
+ { BU21023_NAME, 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, rohm_bu21023_i2c_id);
+
+static struct i2c_driver rohm_bu21023_i2c_driver = {
+ .driver = {
+ .name = BU21023_NAME,
+ },
+ .probe = rohm_bu21023_i2c_probe,
+ .id_table = rohm_bu21023_i2c_id,
+};
+module_i2c_driver(rohm_bu21023_i2c_driver);
+
+MODULE_DESCRIPTION("ROHM BU21023/24 Touchscreen driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("ROHM Co., Ltd.");