| // SPDX-License-Identifier: GPL-2.0-only |
| |
| #include <linux/delay.h> |
| #include <linux/i2c.h> |
| #include <linux/input.h> |
| #include <linux/input/mt.h> |
| #include <linux/input/touchscreen.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/slab.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 |
| |
| 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, void *values, size_t length) |
| { |
| __le16 reg_le = cpu_to_le16(reg); |
| int ret; |
| |
| /* A single i2c_transfer() transaction does not work here. */ |
| ret = i2c_master_send(client, (u8 *)®_le, sizeof(reg_le)); |
| if (ret != sizeof(reg_le)) |
| return ret < 0 ? ret : -EIO; |
| |
| ret = i2c_master_recv(client, (u8 *)values, length); |
| if (ret != length) |
| return ret < 0 ? ret : -EIO; ; |
| |
| return 0; |
| } |
| |
| static int zinitix_write_u16(struct i2c_client *client, u16 reg, u16 value) |
| { |
| __le16 packet[2] = {cpu_to_le16(reg), cpu_to_le16(value)}; |
| int ret; |
| |
| ret = i2c_master_send(client, (u8 *)packet, sizeof(packet)); |
| if (ret != sizeof(packet)) |
| return ret < 0 ? ret : -EIO; |
| |
| return 0; |
| } |
| |
| static int zinitix_write_cmd(struct i2c_client *client, u16 reg) |
| { |
| __le16 reg_le = cpu_to_le16(reg); |
| int ret; |
| |
| ret = i2c_master_send(client, (u8 *)®_le, sizeof(reg_le)); |
| if (ret != sizeof(reg_le)) |
| return ret < 0 ? ret : -EIO; |
| |
| 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, |
| bt541->prop.max_x); |
| if (error) |
| return error; |
| |
| error = zinitix_write_u16(client, BT541_Y_RESOLUTION, |
| bt541->prop.max_y); |
| if (error) |
| return error; |
| |
| error = zinitix_write_u16(client, BT541_SUPPORTED_FINGER_NUM, |
| 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 void zinitix_report_finger(struct bt541_ts_data *bt541, int slot, |
| const struct point_coord *p) |
| { |
| input_mt_slot(bt541->input_dev, slot); |
| input_mt_report_slot_state(bt541->input_dev, MT_TOOL_FINGER, true); |
| touchscreen_report_pos(bt541->input_dev, &bt541->prop, |
| le16_to_cpu(p->x), le16_to_cpu(p->y), true); |
| input_report_abs(bt541->input_dev, ABS_MT_TOUCH_MAJOR, p->width); |
| } |
| |
| static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler) |
| { |
| struct bt541_ts_data *bt541 = bt541_handler; |
| struct i2c_client *client = bt541->client; |
| struct touch_event touch_event; |
| int error; |
| int i; |
| |
| memset(&touch_event, 0, sizeof(struct touch_event)); |
| |
| error = zinitix_read_data(bt541->client, BT541_POINT_STATUS_REG, |
| &touch_event, sizeof(struct touch_event)); |
| if (error) { |
| dev_err(&client->dev, "Failed to read in touchpoint struct\n"); |
| goto out; |
| } |
| |
| for (i = 0; i < MAX_SUPPORTED_FINGER_NUM; i++) |
| if (touch_event.point_coord[i].sub_status & SUB_BIT_EXIST) |
| zinitix_report_finger(bt541, i, |
| &touch_event.point_coord[i]); |
| |
| input_mt_sync_frame(bt541->input_dev); |
| input_sync(bt541->input_dev); |
| |
| out: |
| 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) { |
| 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 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) |
| { |
| struct input_dev *input_dev; |
| int error; |
| |
| input_dev = devm_input_allocate_device(&bt541->client->dev); |
| if (!input_dev) { |
| dev_err(&bt541->client->dev, |
| "Failed to allocate input device."); |
| return -ENOMEM; |
| } |
| |
| input_set_drvdata(input_dev, bt541); |
| bt541->input_dev = input_dev; |
| |
| input_dev->name = "Zinitix Capacitive TouchScreen"; |
| input_dev->phys = "input/ts"; |
| input_dev->id.bustype = BUS_I2C; |
| input_dev->open = zinitix_input_open; |
| input_dev->close = zinitix_input_close; |
| |
| input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X); |
| input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y); |
| input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); |
| input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); |
| |
| touchscreen_parse_properties(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(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(input_dev); |
| if (error) { |
| dev_err(&bt541->client->dev, |
| "Failed to register input device: %d", error); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int zinitix_ts_probe(struct i2c_client *client) |
| { |
| 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 there are devices that don't support mode 2, support |
| * for other modes (0, 1) will be needed. |
| */ |
| dev_err(&client->dev, |
| "Malformed zinitix,mode property, must be 2 (supplied: %d)\n", |
| bt541->zinitix_mode); |
| return -EINVAL; |
| } |
| |
| irq_set_status_flags(client->irq, IRQ_NOAUTOEN); |
| error = devm_request_threaded_irq(&client->dev, client->irq, |
| NULL, zinitix_ts_irq_handler, |
| IRQF_ONESHOT, client->name, bt541); |
| if (error) { |
| dev_err(&client->dev, "Failed to request IRQ: %d\n", error); |
| return error; |
| } |
| |
| 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); |
| |
| 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 ret = 0; |
| |
| mutex_lock(&bt541->input_dev->mutex); |
| |
| if (bt541->input_dev->users) |
| ret = zinitix_start(bt541); |
| |
| mutex_unlock(&bt541->input_dev->mutex); |
| |
| return ret; |
| } |
| |
| 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_new = 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"); |