@@ -0,0 +1,680 @@
+/*
+ * 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/hrtimer.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>
+
+#include "rohm_bu21023.h"
+
+struct rohm_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+
+ bool initialized;
+
+ unsigned int untouch_count;
+ unsigned int single_touch_count;
+ unsigned int dual_touch_count;
+ unsigned int prev_touch_report;
+};
+
+/*
+ * rohm_i2c_burst_read - execute combined I2C message for ROHM BU21023/24
+ * @adap: Handle to I2C bus
+ * @msgs: combined messages to execute
+ * @num: Number of messages to be executed.
+ *
+ * Returns negative errno, else the number of messages executed.
+ *
+ * Note
+ * In BU21023/24 burst read, stop condition is needed after "address write".
+ * Therefore, transmission is performed in 2 steps.
+ */
+static inline int rohm_i2c_burst_read(struct i2c_adapter *adap,
+ struct i2c_msg *msgs, int num)
+{
+ int ret, i;
+
+ if (!adap->algo->master_xfer) {
+ dev_err(&adap->dev, "I2C level transfers not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ i2c_lock_adapter(adap);
+
+ for (i = 0; i < num; i++) {
+ ret = __i2c_transfer(adap, &msgs[i], 1);
+ if (ret < 0)
+ break;
+
+ ret = i;
+ }
+
+ i2c_unlock_adapter(adap);
+
+ return ret;
+}
+
+static unsigned long inactive_polling_interval[2] = { 1, 0 };
+static unsigned long active_polling_interval[2] = { 0, 10000000 };
+
+module_param_array(inactive_polling_interval, ulong, NULL, S_IRUGO | S_IWUSR);
+module_param_array(active_polling_interval, ulong, NULL, S_IRUGO | S_IWUSR);
+
+MODULE_PARM_DESC(inactive_polling_interval,
+ "Polling interval for un-touch detection");
+MODULE_PARM_DESC(active_polling_interval,
+ "Polling interval for touch detection");
+
+#define INACTIVE_POLLING_INTERVAL_KTIME \
+ ktime_set(inactive_polling_interval[0], inactive_polling_interval[1])
+#define ACTIVE_POLLING_INTERVAL_KTIME \
+ ktime_set(active_polling_interval[0], active_polling_interval[1])
+
+static unsigned int untouch_threshold[3] = { 0, 1, 5 };
+static unsigned int single_touch_threshold[3] = { 0, 0, 4 };
+static unsigned int dual_touch_threshold[3] = { 10, 8, 0 };
+
+module_param_array(untouch_threshold, uint, NULL, S_IRUGO | S_IWUSR);
+module_param_array(single_touch_threshold, uint, NULL, S_IRUGO | S_IWUSR);
+module_param_array(dual_touch_threshold, uint, NULL, S_IRUGO | S_IWUSR);
+
+MODULE_PARM_DESC(untouch_threshold, "Thresholds for un-touch detection");
+MODULE_PARM_DESC(single_touch_threshold,
+ "Thresholds for single touch detection");
+MODULE_PARM_DESC(dual_touch_threshold, "Thresholds for dual touch detection");
+
+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_dev;
+ struct device *dev = &client->dev;
+
+ struct i2c_msg msg[2];
+ u16 addr = client->addr;
+ u8 addr_buf;
+ u8 buf[10]; /* for 0x20-0x29 */
+
+ struct input_mt_pos pos[BU21023_MAX_SLOTS];
+ int slots[BU21023_MAX_SLOTS];
+ u8 touch_flags;
+ unsigned int threshold;
+ int touch_report = 0;
+ unsigned int prev_touch_report = ts->prev_touch_report;
+
+ s32 status;
+ int i, ret;
+
+ status = i2c_smbus_read_byte_data(client, INT_STATUS);
+ if (!status)
+ return IRQ_NONE;
+
+ if (status < 0)
+ return IRQ_HANDLED;
+
+ ret = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
+ if (ret)
+ return IRQ_HANDLED;
+
+ /* Clear all interrupts */
+ ret = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (ret)
+ return IRQ_HANDLED;
+
+ addr_buf = POS_X1_H;
+ msg[0].addr = addr;
+ msg[0].flags = 0;
+ msg[0].len = 1;
+ msg[0].buf = &addr_buf;
+
+ msg[1].addr = addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].len = sizeof(buf);
+ msg[1].buf = buf;
+
+#define READ_POS_BUF(reg) ((u16)buf[((reg) - POS_X1_H)])
+
+ ret = rohm_i2c_burst_read(client->adapter, msg, 2);
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ touch_flags = READ_POS_BUF(TOUCH_GESTURE) & TOUCH_MASK;
+ if (touch_flags) {
+ /* generate coordinates */
+ pos[0].x = (READ_POS_BUF(POS_X1_H) << 2) |
+ READ_POS_BUF(POS_X1_L);
+ pos[0].y = (READ_POS_BUF(POS_Y1_H) << 2) |
+ READ_POS_BUF(POS_Y1_L);
+ pos[1].x = (READ_POS_BUF(POS_X2_H) << 2) |
+ READ_POS_BUF(POS_X2_L);
+ pos[1].y = (READ_POS_BUF(POS_Y2_H) << 2) |
+ READ_POS_BUF(POS_Y2_L);
+
+ switch (touch_flags) {
+ case SINGLE_TOUCH:
+ ts->untouch_count = 0;
+ ts->single_touch_count++;
+ ts->dual_touch_count = 0;
+
+ threshold = single_touch_threshold[prev_touch_report];
+ if (ts->single_touch_count > threshold)
+ touch_report = 1;
+
+ if (touch_report == 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:
+ ts->untouch_count = 0;
+ ts->single_touch_count = 0;
+ ts->dual_touch_count++;
+
+ threshold = dual_touch_threshold[prev_touch_report];
+ if (ts->dual_touch_count > threshold)
+ touch_report = 2;
+ break;
+ default:
+ dev_err(dev,
+ "Three or more touches are not supported\n");
+ return IRQ_HANDLED;
+ break;
+ }
+ } else {
+ ts->untouch_count++;
+
+ threshold = untouch_threshold[prev_touch_report];
+ if (ts->untouch_count > threshold) {
+ ts->untouch_count = 0;
+ ts->single_touch_count = 0;
+ ts->dual_touch_count = 0;
+
+ touch_report = 0;
+ }
+ }
+
+ input_mt_assign_slots(input_dev, slots, pos, touch_report);
+
+ for (i = 0; i < touch_report; 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);
+
+ i2c_smbus_write_byte_data(client, INT_MASK,
+ CALIBRATION_DONE | SLEEP_OUT | SLEEP_IN |
+ PROGRAM_LOAD_DONE);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t rohm_ts_hard_irq(int irq, void *dev_id)
+{
+ return IRQ_WAKE_THREAD;
+}
+
+static int rohm_ts_load_firmware(struct i2c_client *client,
+ const char *firmware_name)
+{
+ struct device *dev = &client->dev;
+ const struct firmware *firmware = NULL;
+ s32 status;
+ int blocks, remainder, retry = 0, offset;
+ int err = 0, ret;
+ int i;
+
+ ret = request_firmware(&firmware, firmware_name, dev);
+ if (ret) {
+ dev_err(dev, "Unable to open firmware %s\n", firmware_name);
+ return ret;
+ }
+
+ blocks = firmware->size / FIRMWARE_BLOCK_SIZE;
+ remainder = firmware->size % FIRMWARE_BLOCK_SIZE;
+
+ ret = i2c_smbus_write_byte_data(client, INT_MASK,
+ COORD_UPDATE | CALIBRATION_DONE |
+ SLEEP_IN | SLEEP_OUT);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+
+ while (retry < FIRMWARE_RETRY_MAX) {
+ ret = i2c_smbus_write_byte_data(client, COMMON_SETUP1,
+ COMMON_SETUP1_DEFAULT);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, EX_ADDR_H, 0);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, EX_ADDR_L, 0);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+
+ offset = 0;
+
+ /* firmware load to the device */
+ for (i = 0; i < blocks; i++) {
+ ret = i2c_smbus_write_i2c_block_data(client, EX_WDAT,
+ FIRMWARE_BLOCK_SIZE, &firmware->data[offset]);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+
+ offset += FIRMWARE_BLOCK_SIZE;
+ }
+
+ if (remainder) {
+ ret = i2c_smbus_write_i2c_block_data(client, EX_WDAT,
+ remainder, &firmware->data[offset]);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+ }
+
+ /* check formware load result */
+ status = i2c_smbus_read_byte_data(client, INT_STATUS);
+ if (status < 0) {
+ err = status;
+ goto err_int_mask_exit;
+ }
+
+ /* clear all interrupts */
+ ret = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+
+ if (status == PROGRAM_LOAD_DONE)
+ break;
+
+ /* settings for retry */
+ ret = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
+ if (ret) {
+ err = ret;
+ goto err_int_mask_exit;
+ }
+
+ retry++;
+ dev_warn(dev, "Retry firmware load\n");
+ }
+
+err_int_mask_exit:
+ ret = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
+ if (ret)
+ err = ret;
+
+ release_firmware(firmware);
+
+ if (retry >= FIRMWARE_RETRY_MAX)
+ return -EBUSY;
+
+ return err;
+}
+
+static bool swap_xy;
+module_param(swap_xy, bool, S_IRUGO);
+MODULE_PARM_DESC(swap_xy, "Swap X-axis and Y-axis");
+
+static bool inv_x;
+module_param(inv_x, bool, S_IRUGO);
+MODULE_PARM_DESC(inv_x, "Invert X-axis");
+
+static bool inv_y;
+module_param(inv_y, bool, S_IRUGO);
+MODULE_PARM_DESC(inv_y, "Invert Y-axis");
+
+static int rohm_ts_device_init(struct rohm_ts_data *ts)
+{
+ struct i2c_client *client = ts->client;
+ struct device *dev = &client->dev;
+ u8 val;
+ int ret;
+
+ /*
+ * Wait 200usec for reset
+ */
+ udelay(200);
+
+ /* Release analog reset */
+ ret = i2c_smbus_write_byte_data(client, SYSTEM, ANALOG_POWER_ON);
+ if (ret)
+ return ret;
+
+ /* Waiting for the analog warm-up, max. 200usec */
+ udelay(200);
+
+ /* clear all interrupts */
+ ret = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (ret)
+ return ret;
+
+ val = MAF_1SAMPLE;
+ if (swap_xy)
+ val |= SWAP_XY;
+ if (inv_x)
+ val |= INV_X;
+ if (inv_y)
+ val |= INV_Y;
+
+ ret = i2c_smbus_write_byte_data(client, EX_WDAT, 0);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, COMMON_SETUP1, 0);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, COMMON_SETUP2, val);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, COMMON_SETUP3,
+ SEL_TBL_DEFAULT | EN_MULTI);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, THRESHOLD_GESTURE,
+ THRESHOLD_GESTURE_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, INTERVAL_TIME,
+ INTERVAL_TIME_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, CPU_FREQ, CPU_FREQ_10MHZ);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, PRM_SWOFF_TIME,
+ PRM_SWOFF_TIME_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, ADC_CTRL, ADC_DIV_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, ADC_WAIT, ADC_WAIT_DEFAULT);
+ if (ret)
+ return ret;
+
+ /*
+ * Panel setup, these values change with the panel.
+ */
+ ret = i2c_smbus_write_byte_data(client, STEP_X, STEP_X_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, STEP_Y, STEP_Y_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, OFFSET_X, OFFSET_X_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, OFFSET_Y, OFFSET_Y_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, THRESHOLD_TOUCH,
+ THRESHOLD_TOUCH_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, EVR_XY, EVR_XY_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, EVR_X, EVR_X_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, EVR_Y, EVR_Y_DEFAULT);
+ if (ret)
+ return ret;
+
+ /* Fixed value settings */
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_ADJUST,
+ CALIBRATION_ADJUST_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, SWCONT, SWCONT_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, TEST1,
+ DUALTOUCH_STABILIZE_ON |
+ DUALTOUCH_REG_ON);
+ if (ret)
+ return ret;
+
+ ret = rohm_ts_load_firmware(client, BU21023_FIRMWARE_NAME);
+ if (ret) {
+ dev_err(dev, "Failed to firmware load\n");
+ return ret;
+ }
+
+ /*
+ * 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.
+ */
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
+ CALIBRATION_REG1_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
+ CALIBRATION_REG2_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
+ CALIBRATION_REG3_DEFAULT);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_OFF);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_ON);
+ if (ret)
+ return ret;
+
+ /* Clear all interrupts */
+ ret = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (ret)
+ return ret;
+
+ ret = devm_request_threaded_irq(dev, client->irq, rohm_ts_hard_irq,
+ rohm_ts_soft_irq, IRQF_TRIGGER_FALLING,
+ client->name, ts);
+ if (ret) {
+ dev_err(dev, "Unable to request IRQ\n");
+ return ret;
+ }
+
+ /* Enable coordinates update interrupt */
+ ret = i2c_smbus_write_byte_data(client, INT_MASK,
+ CALIBRATION_DONE |
+ SLEEP_OUT | SLEEP_IN |
+ PROGRAM_LOAD_DONE);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, ERR_MASK,
+ PROGRAM_LOAD_ERR | CPU_TIMEOUT |
+ ADC_TIMEOUT);
+ if (ret)
+ return ret;
+
+ /* controller CPU power on */
+ ret = i2c_smbus_write_byte_data(client, SYSTEM,
+ CPU_POWER_ON | ANALOG_POWER_ON);
+
+ return ret;
+}
+
+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 ret;
+
+ if (!ts->initialized) {
+ ret = rohm_ts_device_init(ts);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to device initialization\n");
+ return ret;
+ }
+
+ ts->initialized = true;
+ }
+
+ return 0;
+}
+
+static int rohm_bu21023_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct rohm_ts_data *ts;
+ struct device *dev = &client->dev;
+ struct input_dev *input_dev;
+ int ret;
+
+ if (!client->irq) {
+ dev_err(dev, "IRQ is not assigned\n");
+ return -EBUSY;
+ }
+
+ ts = devm_kzalloc(dev, sizeof(struct rohm_ts_data), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->client = client;
+ i2c_set_clientdata(client, ts);
+
+ input_dev = devm_input_allocate_device(dev);
+ if (!input_dev)
+ return -ENOMEM;
+
+ input_dev->name = BU21023_NAME;
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->open = rohm_ts_open;
+
+ ts->input_dev = input_dev;
+ input_set_drvdata(input_dev, ts);
+
+ __set_bit(EV_SYN, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(EV_ABS, input_dev->evbit);
+
+ __set_bit(BTN_TOUCH, input_dev->keybit);
+
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X,
+ ROHM_TS_ABS_X_MIN, ROHM_TS_ABS_X_MAX, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
+ ROHM_TS_ABS_Y_MIN, ROHM_TS_ABS_Y_MAX, 0, 0);
+
+ input_set_abs_params(input_dev, ABS_X,
+ ROHM_TS_ABS_X_MIN, ROHM_TS_ABS_X_MAX, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y,
+ ROHM_TS_ABS_Y_MIN, ROHM_TS_ABS_Y_MAX, 0, 0);
+
+ ret = input_mt_init_slots(input_dev, BU21023_MAX_SLOTS,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (ret) {
+ dev_err(dev, "Failed to multi touch slots initialization\n");
+ return ret;
+ }
+
+ ret = input_register_device(input_dev);
+ if (ret)
+ dev_err(dev, "Unable to register input device\n");
+
+ return ret;
+}
+
+static int rohm_bu21023_i2c_remove(struct i2c_client *client)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, SYSTEM,
+ ANALOG_POWER_ON | CPU_POWER_OFF);
+ if (ret)
+ return ret;
+
+ return i2c_smbus_write_byte_data(client, SYSTEM,
+ ANALOG_POWER_OFF | CPU_POWER_OFF);
+}
+
+static const struct i2c_device_id rohm_bu21023_i2c_id[] = {
+ {BU21023_NAME, 0},
+ {},
+};
+
+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,
+ .remove = rohm_bu21023_i2c_remove,
+ .id_table = rohm_bu21023_i2c_id,
+};
+
+module_i2c_driver(rohm_bu21023_i2c_driver);
+
+MODULE_DESCRIPTION("ROHM BU21023/24 Touchscreen driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ROHM Co., Ltd.");