@@ -1322,4 +1322,16 @@ config TOUCHSCREEN_IQS5XX
To compile this driver as a module, choose M here: the
module will be called iqs5xx.
+config TOUCHSCREEN_ZINITIX
+ tristate "Zinitix touchscreen support"
+ depends on I2C
+ help
+ Say Y here if you have a touchscreen using Zinitix bt541,
+ or something similar enough.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called zinitix.
+
endif
@@ -111,3 +111,4 @@ obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o
obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023) += rohm_bu21023.o
obj-$(CONFIG_TOUCHSCREEN_RASPBERRYPI_FW) += raspberrypi-ts.o
obj-$(CONFIG_TOUCHSCREEN_IQS5XX) += iqs5xx.o
+obj-$(CONFIG_TOUCHSCREEN_ZINITIX) += zinitix.o
new file mode 100644
@@ -0,0 +1,601 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <asm/unaligned.h>
+
+/* Register Map */
+
+#define BT541_SWRESET_CMD 0x0000
+#define BT541_WAKEUP_CMD 0x0001
+
+#define BT541_IDLE_CMD 0x0004
+#define BT541_SLEEP_CMD 0x0005
+
+#define BT541_CLEAR_INT_STATUS_CMD 0x0003
+#define BT541_CALIBRATE_CMD 0x0006
+#define BT541_SAVE_STATUS_CMD 0x0007
+#define BT541_SAVE_CALIBRATION_CMD 0x0008
+#define BT541_RECALL_FACTORY_CMD 0x000f
+
+#define BT541_THRESHOLD 0x0020
+
+#define BT541_LARGE_PALM_REJECT_AREA_TH 0x003F
+
+#define BT541_DEBUG_REG 0x0115 /* 0~7 */
+
+#define BT541_TOUCH_MODE 0x0010
+#define BT541_CHIP_REVISION 0x0011
+#define BT541_FIRMWARE_VERSION 0x0012
+
+#define ZINITIX_USB_DETECT 0x116
+
+#define BT541_MINOR_FW_VERSION 0x0121
+
+#define BT541_VENDOR_ID 0x001C
+#define BT541_HW_ID 0x0014
+
+#define BT541_DATA_VERSION_REG 0x0013
+#define BT541_SUPPORTED_FINGER_NUM 0x0015
+#define BT541_EEPROM_INFO 0x0018
+#define BT541_INITIAL_TOUCH_MODE 0x0019
+
+#define BT541_TOTAL_NUMBER_OF_X 0x0060
+#define BT541_TOTAL_NUMBER_OF_Y 0x0061
+
+#define BT541_DELAY_RAW_FOR_HOST 0x007f
+
+#define BT541_BUTTON_SUPPORTED_NUM 0x00B0
+#define BT541_BUTTON_SENSITIVITY 0x00B2
+#define BT541_DUMMY_BUTTON_SENSITIVITY 0X00C8
+
+#define BT541_X_RESOLUTION 0x00C0
+#define BT541_Y_RESOLUTION 0x00C1
+
+#define BT541_POINT_STATUS_REG 0x0080
+#define BT541_ICON_STATUS_REG 0x00AA
+
+#define BT541_POINT_COORD_REG (BT541_POINT_STATUS_REG + 2)
+
+#define BT541_AFE_FREQUENCY 0x0100
+#define BT541_DND_N_COUNT 0x0122
+#define BT541_DND_U_COUNT 0x0135
+
+#define BT541_RAWDATA_REG 0x0200
+
+#define BT541_EEPROM_INFO_REG 0x0018
+
+#define BT541_INT_ENABLE_FLAG 0x00f0
+#define BT541_PERIODICAL_INTERRUPT_INTERVAL 0x00f1
+
+#define BT541_BTN_WIDTH 0x016d
+
+#define BT541_CHECKSUM_RESULT 0x012c
+
+#define BT541_INIT_FLASH 0x01d0
+#define BT541_WRITE_FLASH 0x01d1
+#define BT541_READ_FLASH 0x01d2
+
+#define ZINITIX_INTERNAL_FLAG_02 0x011e
+#define ZINITIX_INTERNAL_FLAG_03 0x011f
+
+#define ZINITIX_I2C_CHECKSUM_WCNT 0x016a
+#define ZINITIX_I2C_CHECKSUM_RESULT 0x016c
+
+/* Interrupt & status register flags */
+
+#define BIT_PT_CNT_CHANGE BIT(0)
+#define BIT_DOWN BIT(1)
+#define BIT_MOVE BIT(2)
+#define BIT_UP BIT(3)
+#define BIT_PALM BIT(4)
+#define BIT_PALM_REJECT BIT(5)
+#define BIT_RESERVED_0 BIT(6)
+#define BIT_RESERVED_1 BIT(7)
+#define BIT_WEIGHT_CHANGE BIT(8)
+#define BIT_PT_NO_CHANGE BIT(9)
+#define BIT_REJECT BIT(10)
+#define BIT_PT_EXIST BIT(11)
+#define BIT_RESERVED_2 BIT(12)
+#define BIT_ERROR BIT(13)
+#define BIT_DEBUG BIT(14)
+#define BIT_ICON_EVENT BIT(15)
+
+#define SUB_BIT_EXIST BIT(0)
+#define SUB_BIT_DOWN BIT(1)
+#define SUB_BIT_MOVE BIT(2)
+#define SUB_BIT_UP BIT(3)
+#define SUB_BIT_UPDATE BIT(4)
+#define SUB_BIT_WAIT BIT(5)
+
+#define DEFAULT_TOUCH_POINT_MODE 2
+#define MAX_SUPPORTED_FINGER_NUM 5
+
+#define CHIP_ON_DELAY 15 // ms
+#define FIRMWARE_ON_DELAY 40 // ms
+
+#define DELAY_FOR_TRANSACTION 50 // μs
+#define DELAY_FOR_POST_TRANSCATION 10 // μs
+
+struct point_coord {
+ __le16 x;
+ __le16 y;
+ u8 width;
+ u8 sub_status;
+ // currently unused, but needed as padding:
+ u8 minor_width;
+ u8 angle;
+};
+
+struct touch_event {
+ __le16 status;
+ u8 finger_cnt;
+ u8 time_stamp;
+ struct point_coord point_coord[MAX_SUPPORTED_FINGER_NUM];
+};
+
+struct bt541_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct touchscreen_properties prop;
+ struct regulator_bulk_data supplies[2];
+ u32 zinitix_mode;
+};
+
+static int zinitix_read_data(struct i2c_client *client, u16 reg, u8 *values, size_t length)
+{
+ int error;
+ __le16 reg_le = cpu_to_le16(reg);
+
+ error = i2c_master_send(client, (u8 *)®_le, sizeof(reg_le));
+ if (error < 0)
+ return error;
+
+ error = i2c_master_recv(client, values, length);
+ if (error != length)
+ return error;
+
+ return 0;
+}
+
+static int zinitix_write_u16(struct i2c_client *client, u16 reg, u16 value)
+{
+ int error;
+ __le16 reg_le = cpu_to_le16(reg);
+ __le16 value_le = cpu_to_le16(value);
+ __le16 packet[2] = {reg_le, value_le};
+
+ error = i2c_master_send(client, (u8 *)packet, 4);
+ if (error < 0)
+ return error;
+
+ return 0;
+}
+
+static int zinitix_write_cmd(struct i2c_client *client, u16 reg)
+{
+ int error;
+ __le16 reg_le = cpu_to_le16(reg);
+
+ error = i2c_master_send(client, (u8 *)®_le, sizeof(reg_le));
+ if (error < 0)
+ return error;
+
+ udelay(DELAY_FOR_POST_TRANSCATION);
+ return 0;
+}
+
+static bool zinitix_init_touch(struct bt541_ts_data *bt541)
+{
+ struct i2c_client *client = bt541->client;
+ int i;
+ int error;
+
+ error = zinitix_write_cmd(client, BT541_SWRESET_CMD);
+ if (error) {
+ dev_err(&client->dev, "Failed to write reset command\n");
+ return error;
+ }
+
+ error = zinitix_write_u16(client, BT541_INT_ENABLE_FLAG, 0x0);
+ if (error) {
+ dev_err(&client->dev, "Failed to reset interrupt enable flag\n");
+ return error;
+ }
+
+ /* initialize */
+ error = zinitix_write_u16(client, BT541_X_RESOLUTION, (u16)bt541->prop.max_x);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, BT541_Y_RESOLUTION, (u16)bt541->prop.max_y);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, BT541_SUPPORTED_FINGER_NUM,
+ (u16)MAX_SUPPORTED_FINGER_NUM);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, BT541_INITIAL_TOUCH_MODE, bt541->zinitix_mode);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, BT541_TOUCH_MODE, bt541->zinitix_mode);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, BT541_INT_ENABLE_FLAG,
+ BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE | BIT_UP);
+ if (error)
+ return error;
+
+ /* clear queue */
+ for (i = 0; i < 10; i++) {
+ zinitix_write_cmd(client, BT541_CLEAR_INT_STATUS_CMD);
+ udelay(10);
+ }
+
+ return 0;
+}
+
+static int zinitix_init_regulators(struct bt541_ts_data *bt541)
+{
+ struct i2c_client *client = bt541->client;
+ int error;
+
+ bt541->supplies[0].supply = "vdd";
+ bt541->supplies[1].supply = "vddo";
+ error = devm_regulator_bulk_get(&client->dev, ARRAY_SIZE(bt541->supplies),
+ bt541->supplies);
+ if (error < 0) {
+ dev_err(&client->dev, "Failed to get regulators: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int zinitix_send_power_on_sequence(struct bt541_ts_data *bt541)
+{
+ int error;
+ struct i2c_client *client = bt541->client;
+
+ error = zinitix_write_u16(client, 0xc000, 0x0001);
+ if (error) {
+ dev_err(&client->dev, "Failed to send power sequence(vendor cmd enable)\n");
+ return error;
+ }
+ udelay(10);
+
+ error = zinitix_write_cmd(client, 0xc004);
+ if (error) {
+ dev_err(&client->dev, "Failed to send power sequence(intn clear)\n");
+ return error;
+ }
+ udelay(10);
+
+ error = zinitix_write_u16(client, 0xc002, 0x0001);
+ if (error) {
+ dev_err(&client->dev, "Failed to send power sequence(nvm init)\n");
+ return error;
+ }
+ mdelay(2);
+
+ error = zinitix_write_u16(client, 0xc001, 0x0001);
+ if (error) {
+ dev_err(&client->dev, "Failed to send power sequence(program start)\n");
+ return error;
+ }
+ msleep(FIRMWARE_ON_DELAY);
+
+ return 0;
+}
+
+static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
+{
+ struct bt541_ts_data *bt541 = (struct bt541_ts_data *)bt541_handler;
+ struct i2c_client *client = bt541->client;
+ struct input_dev *input_dev = bt541->input_dev;
+ int i;
+ int error;
+ struct touch_event touch_event;
+
+ mutex_lock(&input_dev->mutex);
+ if (!input_dev->users) {
+ mutex_unlock(&input_dev->mutex);
+ return IRQ_HANDLED;
+ }
+ mutex_unlock(&input_dev->mutex);
+
+ memset(&touch_event, 0, sizeof(struct touch_event));
+
+ error = zinitix_read_data(bt541->client, BT541_POINT_STATUS_REG,
+ (u8 *)&touch_event, sizeof(struct touch_event));
+ if (error) {
+ dev_err(&client->dev, "Failed to read in touchpoint struct\n");
+
+ zinitix_write_cmd(bt541->client, BT541_CLEAR_INT_STATUS_CMD);
+ return IRQ_HANDLED;
+ }
+
+ for (i = 0; i < MAX_SUPPORTED_FINGER_NUM; i++) {
+ if (!(touch_event.point_coord[i].sub_status & SUB_BIT_EXIST))
+ continue;
+
+ input_mt_slot(bt541->input_dev, i);
+ input_mt_report_slot_state(bt541->input_dev, MT_TOOL_FINGER, true);
+ touchscreen_report_pos(bt541->input_dev, &bt541->prop,
+ le16_to_cpu(touch_event.point_coord[i].x),
+ le16_to_cpu(touch_event.point_coord[i].y), true);
+ input_report_abs(bt541->input_dev, ABS_MT_TOUCH_MAJOR,
+ touch_event.point_coord[i].width);
+ }
+
+ input_mt_sync_frame(bt541->input_dev);
+ input_sync(bt541->input_dev);
+
+ zinitix_write_cmd(bt541->client, BT541_CLEAR_INT_STATUS_CMD);
+
+ return IRQ_HANDLED;
+}
+
+static int zinitix_start(struct bt541_ts_data *bt541)
+{
+ int error;
+
+ error = regulator_bulk_enable(ARRAY_SIZE(bt541->supplies), bt541->supplies);
+ if (error < 0) {
+ dev_err(&bt541->client->dev, "Failed to enable regulators: %d\n", error);
+ return error;
+ }
+
+ msleep(CHIP_ON_DELAY);
+
+ error = zinitix_send_power_on_sequence(bt541);
+ if (error) {
+ dev_err(&bt541->client->dev, "Error while sending power-on sequence: %d\n", error);
+ return error;
+ }
+
+ error = zinitix_init_touch(bt541);
+ if (error) {
+ dev_err(&bt541->client->dev, "Error while configuring touch IC\n");
+ return error;
+ }
+
+ enable_irq(bt541->client->irq);
+
+ return 0;
+}
+
+static int zinitix_stop(struct bt541_ts_data *bt541)
+{
+ int error;
+
+ disable_irq(bt541->client->irq);
+
+ error = regulator_bulk_disable(ARRAY_SIZE(bt541->supplies), bt541->supplies);
+ if (error) {
+ dev_err(&bt541->client->dev, "Failed to disable regulators: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static void zinitix_graceful_shutdown(void *arg)
+{
+ struct bt541_ts_data *bt541 = arg;
+
+ zinitix_stop(bt541);
+}
+
+static int zinitix_input_open(struct input_dev *dev)
+{
+ struct bt541_ts_data *bt541 = input_get_drvdata(dev);
+
+ return zinitix_start(bt541);
+}
+
+static void zinitix_input_close(struct input_dev *dev)
+{
+ struct bt541_ts_data *bt541 = input_get_drvdata(dev);
+
+ zinitix_stop(bt541);
+}
+
+static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
+{
+ int error;
+
+ bt541->input_dev = devm_input_allocate_device(&bt541->client->dev);
+ if (!bt541->input_dev) {
+ dev_err(&bt541->client->dev, "Failed to allocate input device.");
+ return -ENOMEM;
+ }
+
+ bt541->input_dev->name = "Zinitix Capacitive TouchScreen";
+ bt541->input_dev->phys = "input/ts";
+ bt541->input_dev->id.bustype = BUS_I2C;
+ bt541->input_dev->open = zinitix_input_open;
+ bt541->input_dev->close = zinitix_input_close;
+
+ input_set_capability(bt541->input_dev, EV_ABS, ABS_MT_POSITION_X);
+ input_set_capability(bt541->input_dev, EV_ABS, ABS_MT_POSITION_Y);
+ input_set_abs_params(bt541->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
+ input_set_abs_params(bt541->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+
+ touchscreen_parse_properties(bt541->input_dev, true, &bt541->prop);
+
+ if (!bt541->prop.max_x || !bt541->prop.max_y) {
+ dev_err(&bt541->client->dev,
+ "Touchscreen-size-x and/or touchscreen-size-y not set in dts\n");
+ return -EINVAL;
+ }
+
+ error = input_mt_init_slots(bt541->input_dev, MAX_SUPPORTED_FINGER_NUM,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (error) {
+ dev_err(&bt541->client->dev,
+ "Failed to initialize MT slots: %d", error);
+ return error;
+ }
+
+ error = input_register_device(bt541->input_dev);
+ if (error) {
+ dev_err(&bt541->client->dev,
+ "Failed to register input device: %d", error);
+ return error;
+ }
+
+ input_set_drvdata(bt541->input_dev, bt541);
+
+ return 0;
+}
+
+static int zinitix_ts_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct bt541_ts_data *bt541;
+ int error;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "Failed to assert adapter's support for plain I2C.\n");
+ return -ENXIO;
+ }
+
+ bt541 = devm_kzalloc(&client->dev, sizeof(*bt541), GFP_KERNEL);
+ if (!bt541)
+ return -ENOMEM;
+
+ bt541->client = client;
+ i2c_set_clientdata(client, bt541);
+
+ error = zinitix_init_regulators(bt541);
+ if (error) {
+ dev_err(&client->dev, "Failed to initialize regulators: %d\n", error);
+ return error;
+ }
+
+ error = zinitix_init_input_dev(bt541);
+ if (error) {
+ dev_err(&client->dev, "Failed to initialize input device: %d\n", error);
+ return error;
+ }
+
+ error = device_property_read_u32(&client->dev, "zinitix,mode", &bt541->zinitix_mode);
+ if (error < 0) {
+ // fall back to mode 2
+ bt541->zinitix_mode = DEFAULT_TOUCH_POINT_MODE;
+ }
+
+ if (bt541->zinitix_mode != 2) {
+ // if devices are found which don't support mode 2, support for other modes (0, 1)
+ // may be needed.
+ dev_err(&client->dev, "Malformed zinitix,mode property, must be 2 (supplied: %d)\n",
+ bt541->zinitix_mode);
+ return -EINVAL;
+ }
+
+ error = devm_add_action_or_reset(&client->dev,
+ zinitix_graceful_shutdown, bt541);
+ if (error) {
+ dev_err(&client->dev, "Failed to install poweroff handler: %d\n", error);
+ return error;
+ }
+
+ error = devm_request_threaded_irq(&bt541->client->dev, bt541->client->irq,
+ NULL, zinitix_ts_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ bt541->client->name, bt541);
+ if (error) {
+ dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
+ return error;
+ }
+
+ disable_irq(client->irq); // disable the irq until userspace actually tries to use the TS
+
+ dev_info(&client->dev, "Initialized a zinitix touchscreen\n");
+
+ return 0;
+}
+
+static int __maybe_unused zinitix_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bt541_ts_data *bt541 = i2c_get_clientdata(client);
+ int i;
+
+ /* Release all fingers * /
+ for (i = 0; i < MAX_SUPPORTED_FINGER_NUM; i++) {
+ input_mt_slot(bt541->input_dev, i);
+ input_mt_report_slot_state(bt541->input_dev, MT_TOOL_FINGER, false);
+ }
+
+ input_mt_sync_frame(bt541->input_dev);
+ input_sync(bt541->input_dev);
+*/
+ mutex_lock(&bt541->input_dev->mutex);
+
+ if (bt541->input_dev->users)
+ zinitix_stop(bt541);
+
+ mutex_unlock(&bt541->input_dev->mutex);
+
+ return 0;
+}
+
+static int __maybe_unused zinitix_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bt541_ts_data *bt541 = i2c_get_clientdata(client);
+ int error;
+
+ mutex_lock(&bt541->input_dev->mutex);
+
+ if (bt541->input_dev->users) {
+ error = zinitix_start(bt541);
+ if (error) {
+ mutex_unlock(&bt541->input_dev->mutex);
+ return error;
+ }
+ }
+
+ mutex_unlock(&bt541->input_dev->mutex);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(zinitix_pm_ops, zinitix_suspend, zinitix_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id zinitix_of_match[] = {
+ { .compatible = "zinitix,bt541" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, zinitix_of_match);
+#endif
+
+static struct i2c_driver zinitix_ts_driver = {
+ .probe = zinitix_ts_probe,
+ .driver = {
+ .name = "Zinitix-TS",
+ .pm = &zinitix_pm_ops,
+ .of_match_table = of_match_ptr(zinitix_of_match),
+ },
+};
+module_i2c_driver(zinitix_ts_driver);
+
+MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
+MODULE_DESCRIPTION("Zinitix touchscreen driver");
+MODULE_LICENSE("GPL v2");