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path: root/drivers/input/touchscreen/zinitix.c
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-rw-r--r--drivers/input/touchscreen/zinitix.c631
1 files changed, 631 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
new file mode 100644
index 000000000..52f9e9eaa
--- /dev/null
+++ b/drivers/input/touchscreen/zinitix.c
@@ -0,0 +1,631 @@
+// 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 ZINITIX_SWRESET_CMD 0x0000
+#define ZINITIX_WAKEUP_CMD 0x0001
+
+#define ZINITIX_IDLE_CMD 0x0004
+#define ZINITIX_SLEEP_CMD 0x0005
+
+#define ZINITIX_CLEAR_INT_STATUS_CMD 0x0003
+#define ZINITIX_CALIBRATE_CMD 0x0006
+#define ZINITIX_SAVE_STATUS_CMD 0x0007
+#define ZINITIX_SAVE_CALIBRATION_CMD 0x0008
+#define ZINITIX_RECALL_FACTORY_CMD 0x000f
+
+#define ZINITIX_THRESHOLD 0x0020
+
+#define ZINITIX_LARGE_PALM_REJECT_AREA_TH 0x003F
+
+#define ZINITIX_DEBUG_REG 0x0115 /* 0~7 */
+
+#define ZINITIX_TOUCH_MODE 0x0010
+#define ZINITIX_CHIP_REVISION 0x0011
+#define ZINITIX_FIRMWARE_VERSION 0x0012
+
+#define ZINITIX_USB_DETECT 0x116
+
+#define ZINITIX_MINOR_FW_VERSION 0x0121
+
+#define ZINITIX_VENDOR_ID 0x001C
+#define ZINITIX_HW_ID 0x0014
+
+#define ZINITIX_DATA_VERSION_REG 0x0013
+#define ZINITIX_SUPPORTED_FINGER_NUM 0x0015
+#define ZINITIX_EEPROM_INFO 0x0018
+#define ZINITIX_INITIAL_TOUCH_MODE 0x0019
+
+#define ZINITIX_TOTAL_NUMBER_OF_X 0x0060
+#define ZINITIX_TOTAL_NUMBER_OF_Y 0x0061
+
+#define ZINITIX_DELAY_RAW_FOR_HOST 0x007f
+
+#define ZINITIX_BUTTON_SUPPORTED_NUM 0x00B0
+#define ZINITIX_BUTTON_SENSITIVITY 0x00B2
+#define ZINITIX_DUMMY_BUTTON_SENSITIVITY 0X00C8
+
+#define ZINITIX_X_RESOLUTION 0x00C0
+#define ZINITIX_Y_RESOLUTION 0x00C1
+
+#define ZINITIX_POINT_STATUS_REG 0x0080
+#define ZINITIX_ICON_STATUS_REG 0x00AA
+
+#define ZINITIX_POINT_COORD_REG (ZINITIX_POINT_STATUS_REG + 2)
+
+#define ZINITIX_AFE_FREQUENCY 0x0100
+#define ZINITIX_DND_N_COUNT 0x0122
+#define ZINITIX_DND_U_COUNT 0x0135
+
+#define ZINITIX_RAWDATA_REG 0x0200
+
+#define ZINITIX_EEPROM_INFO_REG 0x0018
+
+#define ZINITIX_INT_ENABLE_FLAG 0x00f0
+#define ZINITIX_PERIODICAL_INTERRUPT_INTERVAL 0x00f1
+
+#define ZINITIX_BTN_WIDTH 0x016d
+
+#define ZINITIX_CHECKSUM_RESULT 0x012c
+
+#define ZINITIX_INIT_FLASH 0x01d0
+#define ZINITIX_WRITE_FLASH 0x01d1
+#define ZINITIX_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_mask;
+ 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 *)&reg_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 *)&reg_le, sizeof(reg_le));
+ if (ret != sizeof(reg_le))
+ return ret < 0 ? ret : -EIO;
+
+ return 0;
+}
+
+static int zinitix_init_touch(struct bt541_ts_data *bt541)
+{
+ struct i2c_client *client = bt541->client;
+ int i;
+ int error;
+
+ error = zinitix_write_cmd(client, ZINITIX_SWRESET_CMD);
+ if (error) {
+ dev_err(&client->dev, "Failed to write reset command\n");
+ return error;
+ }
+
+ error = zinitix_write_u16(client, ZINITIX_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, ZINITIX_X_RESOLUTION,
+ bt541->prop.max_x);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, ZINITIX_Y_RESOLUTION,
+ bt541->prop.max_y);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, ZINITIX_SUPPORTED_FINGER_NUM,
+ MAX_SUPPORTED_FINGER_NUM);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, ZINITIX_INITIAL_TOUCH_MODE,
+ bt541->zinitix_mode);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, ZINITIX_TOUCH_MODE,
+ bt541->zinitix_mode);
+ if (error)
+ return error;
+
+ error = zinitix_write_u16(client, ZINITIX_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, ZINITIX_CLEAR_INT_STATUS_CMD);
+ udelay(10);
+ }
+
+ return 0;
+}
+
+static int zinitix_init_regulators(struct bt541_ts_data *bt541)
+{
+ struct device *dev = &bt541->client->dev;
+ int error;
+
+ /*
+ * Some older device trees have erroneous names for the regulators,
+ * so check if "vddo" is present and in that case use these names.
+ * Else use the proper supply names on the component.
+ */
+ if (of_find_property(dev->of_node, "vddo-supply", NULL)) {
+ bt541->supplies[0].supply = "vdd";
+ bt541->supplies[1].supply = "vddo";
+ } else {
+ /* Else use the proper supply names */
+ bt541->supplies[0].supply = "vcca";
+ bt541->supplies[1].supply = "vdd";
+ }
+ error = devm_regulator_bulk_get(dev,
+ ARRAY_SIZE(bt541->supplies),
+ bt541->supplies);
+ if (error < 0) {
+ dev_err(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)
+{
+ u16 x, y;
+
+ if (unlikely(!(p->sub_status &
+ (SUB_BIT_UP | SUB_BIT_DOWN | SUB_BIT_MOVE)))) {
+ dev_dbg(&bt541->client->dev, "unknown finger event %#02x\n",
+ p->sub_status);
+ return;
+ }
+
+ x = le16_to_cpu(p->x);
+ y = le16_to_cpu(p->y);
+
+ input_mt_slot(bt541->input_dev, slot);
+ if (input_mt_report_slot_state(bt541->input_dev, MT_TOOL_FINGER,
+ !(p->sub_status & SUB_BIT_UP))) {
+ touchscreen_report_pos(bt541->input_dev,
+ &bt541->prop, x, y, true);
+ input_report_abs(bt541->input_dev,
+ ABS_MT_TOUCH_MAJOR, p->width);
+ dev_dbg(&bt541->client->dev, "finger %d %s (%u, %u)\n",
+ slot, p->sub_status & SUB_BIT_DOWN ? "down" : "move",
+ x, y);
+ } else {
+ dev_dbg(&bt541->client->dev, "finger %d up (%u, %u)\n",
+ slot, x, y);
+ }
+}
+
+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;
+ unsigned long finger_mask;
+ int error;
+ int i;
+
+ memset(&touch_event, 0, sizeof(struct touch_event));
+
+ error = zinitix_read_data(bt541->client, ZINITIX_POINT_STATUS_REG,
+ &touch_event, sizeof(struct touch_event));
+ if (error) {
+ dev_err(&client->dev, "Failed to read in touchpoint struct\n");
+ goto out;
+ }
+
+ finger_mask = touch_event.finger_mask;
+ for_each_set_bit(i, &finger_mask, MAX_SUPPORTED_FINGER_NUM) {
+ const struct point_coord *p = &touch_event.point_coord[i];
+
+ /* Only process contacts that are actually reported */
+ if (p->sub_status & SUB_BIT_EXIST)
+ zinitix_report_finger(bt541, i, p);
+ }
+
+ input_mt_sync_frame(bt541->input_dev);
+ input_sync(bt541->input_dev);
+
+out:
+ zinitix_write_cmd(bt541->client, ZINITIX_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 = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, zinitix_ts_irq_handler,
+ IRQF_ONESHOT | IRQF_NO_AUTOEN,
+ client->name, bt541);
+ if (error) {
+ dev_err(&client->dev, "Failed to request IRQ: %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;
+ }
+
+ 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 (input_device_enabled(bt541->input_dev))
+ 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 (input_device_enabled(bt541->input_dev))
+ 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,bt402" },
+ { .compatible = "zinitix,bt403" },
+ { .compatible = "zinitix,bt404" },
+ { .compatible = "zinitix,bt412" },
+ { .compatible = "zinitix,bt413" },
+ { .compatible = "zinitix,bt431" },
+ { .compatible = "zinitix,bt432" },
+ { .compatible = "zinitix,bt531" },
+ { .compatible = "zinitix,bt532" },
+ { .compatible = "zinitix,bt538" },
+ { .compatible = "zinitix,bt541" },
+ { .compatible = "zinitix,bt548" },
+ { .compatible = "zinitix,bt554" },
+ { .compatible = "zinitix,at100" },
+ { }
+};
+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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 22:17:11 +0000