* [PATCH v3 1/2] input: Add ROHM BU21023/24 Dual touch support resistive touchscreens
2014-09-24 15:16 [PATCH v3 0/2] Add ROHM BU21023/24 Dual touch support resistive touchscreens Yoichi Yuasa
@ 2014-09-24 15:18 ` Yoichi Yuasa
2014-09-24 15:19 ` [PATCH v3 2/2] input: bu21023_ts: Add calibration function Yoichi Yuasa
2014-10-03 5:16 ` [PATCH v3 0/2] Add ROHM BU21023/24 Dual touch support resistive touchscreens Yuasa Yoichi
2 siblings, 0 replies; 4+ messages in thread
From: Yoichi Yuasa @ 2014-09-24 15:18 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: yuasa, linux-input
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
---
drivers/input/touchscreen/Kconfig | 11 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/rohm_bu21023.c | 680 ++++++++++++++++++++++++++++++
drivers/input/touchscreen/rohm_bu21023.h | 258 ++++++++++++
4 files changed, 950 insertions(+)
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 6bb9a7d..9ae5c88 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -950,4 +950,15 @@ config TOUCHSCREEN_ZFORCE
To compile this driver as a module, choose M here: the
module will be called zforce_ts.
+config TOUCHSCREEN_ROHM_BU21023
+ tristate "ROHM BU21023/24 Dual touch support resistive touchscreens"
+ depends on I2C
+ help
+ Say Y here if you have a touchscreen using ROHM BU21023/24.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called bu21023_ts.
+
endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 4be94fc..af766d0 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE) += usbtouchscreen.o
obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
obj-$(CONFIG_TOUCHSCREEN_PIXCIR) += pixcir_i2c_ts.o
+obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
diff --git a/drivers/input/touchscreen/rohm_bu21023.c b/drivers/input/touchscreen/rohm_bu21023.c
new file mode 100644
index 0000000..a35a914
--- /dev/null
+++ b/drivers/input/touchscreen/rohm_bu21023.c
@@ -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.");
diff --git a/drivers/input/touchscreen/rohm_bu21023.h b/drivers/input/touchscreen/rohm_bu21023.h
new file mode 100644
index 0000000..302581b
--- /dev/null
+++ b/drivers/input/touchscreen/rohm_bu21023.h
@@ -0,0 +1,258 @@
+/*
+ * 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.
+ */
+#ifndef _BU21023_TS_H
+#define _BU21023_TS_H
+
+#define BU21023_NAME "bu21023_ts"
+#define BU21023_FIRMWARE_NAME "bu21023.bin"
+
+#define BU21023_MAX_SLOTS 2
+
+#define AXIS_ADJUST 4
+#define AXIS_OFFSET 8
+
+#define FIRMWARE_BLOCK_SIZE 32
+#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
+
+/*
+ * 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
+
+#endif /* _BU21023_TS_H */
--
1.7.9.5
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH v3 2/2] input: bu21023_ts: Add calibration function
2014-09-24 15:16 [PATCH v3 0/2] Add ROHM BU21023/24 Dual touch support resistive touchscreens Yoichi Yuasa
2014-09-24 15:18 ` [PATCH v3 1/2] input: " Yoichi Yuasa
@ 2014-09-24 15:19 ` Yoichi Yuasa
2014-10-03 5:16 ` [PATCH v3 0/2] Add ROHM BU21023/24 Dual touch support resistive touchscreens Yuasa Yoichi
2 siblings, 0 replies; 4+ messages in thread
From: Yoichi Yuasa @ 2014-09-24 15:19 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: yuasa, linux-input
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
---
drivers/input/touchscreen/rohm_bu21023.c | 250 ++++++++++++++++++++++++++++++
1 file changed, 250 insertions(+)
diff --git a/drivers/input/touchscreen/rohm_bu21023.c b/drivers/input/touchscreen/rohm_bu21023.c
index a35a914..de6717f 100644
--- a/drivers/input/touchscreen/rohm_bu21023.c
+++ b/drivers/input/touchscreen/rohm_bu21023.c
@@ -72,6 +72,251 @@ static inline int rohm_i2c_burst_read(struct i2c_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;
+ struct i2c_msg msg[2];
+ u8 buf[33];
+ u8 addr_buf; /* burst read start address */
+
+ 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 err = 0, ret;
+ int i;
+
+ addr_buf = PRM1_X_H;
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].len = 1;
+ msg[0].buf = &addr_buf;
+
+ msg[1].addr = client->addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].len = sizeof(buf);
+ msg[1].buf = buf;
+
+#define READ_CALIB_BUF(reg) ((u16)buf[((reg) - PRM1_X_H)])
+
+ 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;
+
+ ret = i2c_smbus_write_byte_data(client, INT_MASK,
+ COORD_UPDATE | SLEEP_IN | SLEEP_OUT |
+ PROGRAM_LOAD_DONE);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, TEST1, DUALTOUCH_STABILIZE_ON);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ for (retry = 0; retry < CALIBRATION_RETRY_MAX; retry++) {
+ /* wait 2 sampling for update */
+ mdelay(2 * SAMPLING_DELAY);
+
+ ret = rohm_i2c_burst_read(client->adapter, msg, 2);
+ if (ret < 0) {
+ err = ret;
+ goto err_exit;
+ }
+
+ if (READ_CALIB_BUF(TOUCH) & TOUCH_DETECT)
+ continue;
+
+ if (first_time) {
+ /* generate calibration parameter */
+ calib_x =
+ (READ_CALIB_BUF(PRM1_X_H) << 2 |
+ READ_CALIB_BUF(PRM1_X_L)) - AXIS_OFFSET;
+ calib_y =
+ (READ_CALIB_BUF(PRM1_Y_H) << 2 |
+ READ_CALIB_BUF(PRM1_Y_L)) - AXIS_OFFSET;
+
+ ret = i2c_smbus_write_byte_data(client, TEST1,
+ DUALTOUCH_STABILIZE_ON |
+ DUALTOUCH_REG_ON);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ first_time = false;
+ } else {
+ /* generate adjustment parameter */
+ err_x = READ_CALIB_BUF(PRM1_X_H) << 2 |
+ READ_CALIB_BUF(PRM1_X_L);
+ err_y = 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;
+
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG1, reg1);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG2, reg2);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG3, reg3);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ /*
+ * force calibration sequcence
+ */
+ ret = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_OFF);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, FORCE_CALIBRATION,
+ FORCE_CALIBRATION_ON);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ /* clear all interrupts */
+ ret = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ /*
+ * 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) {
+ err = val;
+ goto err_exit;
+ }
+ }
+
+ if (calibration_done) {
+ val = i2c_smbus_read_byte_data(client, INT_STATUS);
+ if (val == CALIBRATION_DONE) {
+ success = true;
+ break;
+ } else if (val < 0) {
+ err = val;
+ goto err_exit;
+ }
+ } else
+ dev_warn(dev, "Calibration timeout\n");
+ }
+
+ if (!success) {
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG1,
+ reg1_orig);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG2,
+ reg2_orig);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, CALIBRATION_REG3,
+ reg3_orig);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ /* calibration data enable */
+ ret = i2c_smbus_write_byte_data(client, TEST1,
+ DUALTOUCH_STABILIZE_ON |
+ DUALTOUCH_REG_ON);
+ if (ret) {
+ err = ret;
+ goto err_exit;
+ }
+
+ /* wait 10 sampling */
+ mdelay(10 * SAMPLING_DELAY);
+
+ err = -EBUSY;
+ }
+
+err_exit:
+ ret = i2c_smbus_write_byte_data(client, INT_MASK, INT_ALL);
+ if (!ret)
+ /* Clear all interrupts */
+ ret = i2c_smbus_write_byte_data(client, INT_CLEAR, 0xff);
+
+ if (!err && ret)
+ err = ret;
+
+ return err;
+}
+
static unsigned long inactive_polling_interval[2] = { 1, 0 };
static unsigned long active_polling_interval[2] = { 0, 10000000 };
@@ -228,6 +473,11 @@ static irqreturn_t rohm_ts_soft_irq(int irq, void *dev_id)
input_mt_report_pointer_emulation(input_dev, true);
input_sync(input_dev);
+ if (READ_POS_BUF(TOUCH_GESTURE) & CALIBRATION_REQUEST) {
+ if (rohm_ts_manual_calibration(ts) < 0)
+ dev_warn(dev, "Failed to manual calibration\n");
+ }
+
i2c_smbus_write_byte_data(client, INT_MASK,
CALIBRATION_DONE | SLEEP_OUT | SLEEP_IN |
PROGRAM_LOAD_DONE);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 4+ messages in thread