--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *
+ * TINKER BOARD FT5406 touch driver.
+ *
+ * Copyright (c) 2016 ASUSTek Computer Inc.
+ * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
+ *
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+
+#define LOG_DBG(fmt, arg...) pr_debug("tinker-ft5406: %s: "fmt, __func__, ##arg)
+#define LOG_INFO(fmt, arg...) pr_info("tinker-ft5406: %s: "fmt, __func__, ##arg)
+#define LOG_ERR(fmt, arg...) pr_err("tinker-ft5406: %s: "fmt, __func__, ##arg)
+
+#define RETRY_COUNT 10
+#define FT_ONE_TCH_LEN 6
+
+#define FT_REG_FW_VER 0xA6
+#define FT_REG_FW_MIN_VER 0xB2
+#define FT_REG_FW_SUB_MIN_VER 0xB3
+
+#define VALID_TD_STATUS_VAL 10
+#define MAX_TOUCH_POINTS 1
+
+#define FT_PRESS 0x7F
+#define FT_MAX_ID 0x0F
+
+#define FT_TOUCH_X_H 0
+#define FT_TOUCH_X_L 1
+#define FT_TOUCH_Y_H 2
+#define FT_TOUCH_Y_L 3
+#define FT_TOUCH_EVENT 0
+#define FT_TOUCH_ID 2
+
+#define FT_TOUCH_X_H_REG 3
+#define FT_TOUCH_X_L_REG 4
+#define FT_TOUCH_Y_H_REG 5
+#define FT_TOUCH_Y_L_REG 6
+#define FT_TD_STATUS_REG 2
+#define FT_TOUCH_EVENT_REG 3
+#define FT_TOUCH_ID_REG 5
+
+#define FT_TOUCH_DOWN 0
+#define FT_TOUCH_CONTACT 2
+
+struct ts_event {
+ u16 au16_x[MAX_TOUCH_POINTS]; /*x coordinate */
+ u16 au16_y[MAX_TOUCH_POINTS]; /*y coordinate */
+ u8 au8_touch_event[MAX_TOUCH_POINTS]; /*touch event: 0:down; 1:up; 2:contact */
+ u8 au8_finger_id[MAX_TOUCH_POINTS]; /*touch ID */
+ u16 pressure;
+ u8 touch_point;
+ u8 point_num;
+};
+
+struct tinker_ft5406_data {
+ struct device *dev;
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct ts_event event;
+ struct work_struct ft5406_work;
+
+ int screen_width;
+ int screen_height;
+ int xy_reverse;
+ int is_polling;
+ int known_ids;
+ int retry_count;
+};
+
+struct tinker_ft5406_data *g_ts_data;
+int g_mcu_ready;
+
+static int fts_i2c_read(struct i2c_client *client, char *writebuf,
+ int writelen, char *readbuf, int readlen)
+{
+ int ret;
+
+ if (writelen > 0) {
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = writelen,
+ .buf = writebuf,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = readlen,
+ .buf = readbuf,
+ },
+ };
+ ret = i2c_transfer(client->adapter, msgs, 2);
+ if (ret < 0)
+ LOG_ERR("i2c read error, %d\n", ret);
+ } else {
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = readlen,
+ .buf = readbuf,
+ },
+ };
+ ret = i2c_transfer(client->adapter, msgs, 1);
+ if (ret < 0)
+ LOG_ERR("i2c read error, %d\n", ret);
+ }
+
+ return ret;
+}
+
+static int fts_read_reg(struct i2c_client *client, u8 addr, u8 *val)
+{
+ return fts_i2c_read(client, &addr, 1, val, 1);
+}
+
+static int fts_check_fw_ver(struct i2c_client *client)
+{
+ u8 reg_addr, fw_ver[3];
+ int ret;
+
+ reg_addr = FT_REG_FW_VER;
+ ret = fts_i2c_read(client, ®_addr, 1, &fw_ver[0], 1);
+ if (ret < 0)
+ goto error;
+
+ reg_addr = FT_REG_FW_MIN_VER;
+ ret = fts_i2c_read(client, ®_addr, 1, &fw_ver[1], 1);
+ if (ret < 0)
+ goto error;
+
+ reg_addr = FT_REG_FW_SUB_MIN_VER;
+ ret = fts_i2c_read(client, ®_addr, 1, &fw_ver[2], 1);
+ if (ret < 0)
+ goto error;
+
+ LOG_INFO("Firmware version = %d.%d.%d\n", fw_ver[0], fw_ver[1], fw_ver[2]);
+ return 0;
+
+error:
+ return ret;
+}
+
+static int fts_read_td_status(struct tinker_ft5406_data *ts_data)
+{
+ u8 td_status;
+ int ret = -1;
+
+ ret = fts_read_reg(ts_data->client, FT_TD_STATUS_REG, &td_status);
+ if (ret < 0) {
+ LOG_ERR("get reg td_status failed, %d\n", ret);
+ return ret;
+ }
+ return (int)td_status;
+}
+
+static int fts_read_touchdata(struct tinker_ft5406_data *ts_data)
+{
+ struct ts_event *event = &ts_data->event;
+ int ret = -1, i;
+ u8 buf[FT_ONE_TCH_LEN-2] = { 0 };
+ u8 reg_addr, pointid = FT_MAX_ID;
+
+ for (i = 0; i < event->touch_point && i < MAX_TOUCH_POINTS; i++) {
+ reg_addr = FT_TOUCH_X_H_REG + (i * FT_ONE_TCH_LEN);
+ ret = fts_i2c_read(ts_data->client, ®_addr, 1, buf, FT_ONE_TCH_LEN-2);
+ if (ret < 0) {
+ LOG_ERR("read touchdata failed.\n");
+ return ret;
+ }
+
+ pointid = (buf[FT_TOUCH_ID]) >> 4;
+ if (pointid >= MAX_TOUCH_POINTS)
+ break;
+ event->au8_finger_id[i] = pointid;
+ event->au16_x[i] = (s16) (buf[FT_TOUCH_X_H] & 0x0F) << 8 | (s16) buf[FT_TOUCH_X_L];
+ event->au16_y[i] = (s16) (buf[FT_TOUCH_Y_H] & 0x0F) << 8 | (s16) buf[FT_TOUCH_Y_L];
+ event->au8_touch_event[i] = buf[FT_TOUCH_EVENT] >> 6;
+
+ if (ts_data->xy_reverse) {
+ event->au16_x[i] = ts_data->screen_width - event->au16_x[i] - 1;
+ event->au16_y[i] = ts_data->screen_height - event->au16_y[i] - 1;
+ }
+ }
+ event->pressure = FT_PRESS;
+
+ return 0;
+}
+
+static void fts_report_value(struct tinker_ft5406_data *ts_data)
+{
+ struct ts_event *event = &ts_data->event;
+ int i, modified_ids = 0, released_ids;
+
+ for (i = 0; i < event->touch_point && i < MAX_TOUCH_POINTS; i++) {
+ if (event->au8_touch_event[i] == FT_TOUCH_DOWN ||
+ event->au8_touch_event[i] == FT_TOUCH_CONTACT) {
+ modified_ids |= 1 << event->au8_finger_id[i];
+ input_mt_slot(ts_data->input_dev, event->au8_finger_id[i]);
+ input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER,
+ true);
+ input_report_abs(ts_data->input_dev, ABS_MT_TOUCH_MAJOR,
+ event->pressure);
+ input_report_abs(ts_data->input_dev, ABS_MT_POSITION_X,
+ event->au16_x[i]);
+ input_report_abs(ts_data->input_dev, ABS_MT_POSITION_Y,
+ event->au16_y[i]);
+
+ if (!((1 << event->au8_finger_id[i]) & ts_data->known_ids))
+ LOG_DBG("Touch id-%d: x = %d, y = %d\n",
+ event->au8_finger_id[i],
+ event->au16_x[i],
+ event->au16_y[i]);
+ }
+ }
+
+ released_ids = ts_data->known_ids & ~modified_ids;
+ for (i = 0; released_ids && i < MAX_TOUCH_POINTS; i++) {
+ if (released_ids & (1<<i)) {
+ LOG_DBG("Release id-%d, known = %x modified = %x\n",
+ i, ts_data->known_ids, modified_ids);
+ input_mt_slot(ts_data->input_dev, i);
+ input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER, false);
+ modified_ids &= ~(1 << i);
+ }
+ }
+ ts_data->known_ids = modified_ids;
+ input_mt_report_pointer_emulation(ts_data->input_dev, true);
+ input_sync(ts_data->input_dev);
+}
+
+static void fts_retry_clear(struct tinker_ft5406_data *ts_data)
+{
+ if (ts_data->retry_count != 0)
+ ts_data->retry_count = 0;
+}
+
+static int fts_retry_wait(struct tinker_ft5406_data *ts_data)
+{
+ if (ts_data->retry_count < RETRY_COUNT) {
+ LOG_INFO("wait and retry, count = %d\n", ts_data->retry_count);
+ ts_data->retry_count++;
+ msleep(1000);
+ return 1;
+ }
+ LOG_ERR("attach retry count\n");
+ return 0;
+}
+
+static void tinker_ft5406_work(struct work_struct *work)
+{
+ struct ts_event *event = &g_ts_data->event;
+ int ret = 0, count = 5, td_status;
+
+ while (count > 0) {
+ ret = fts_check_fw_ver(g_ts_data->client);
+ if (ret == 0)
+ break;
+ LOG_INFO("checking touch ic, countdown: %d\n", count);
+ msleep(1000);
+ count--;
+ }
+ if (!count) {
+ LOG_ERR("checking touch ic timeout, %d\n", ret);
+ g_ts_data->is_polling = 0;
+ return;
+ }
+
+ /* polling 60fps */
+ while (1) {
+ td_status = fts_read_td_status(g_ts_data);
+ if (td_status < 0) {
+ ret = fts_retry_wait(g_ts_data);
+ if (ret == 0) {
+ LOG_ERR("stop touch polling\n");
+ g_ts_data->is_polling = 0;
+ break;
+ }
+ } else if (td_status < VALID_TD_STATUS_VAL + 1 &&
+ (td_status > 0 || g_ts_data->known_ids != 0)) {
+ fts_retry_clear(g_ts_data);
+ memset(event, -1, sizeof(struct ts_event));
+ event->touch_point = td_status;
+ ret = fts_read_touchdata(g_ts_data);
+ if (ret == 0)
+ fts_report_value(g_ts_data);
+ }
+ msleep_interruptible(17);
+ }
+}
+
+void tinker_ft5406_start_polling(void)
+{
+ if (g_ts_data == NULL) {
+ LOG_ERR("touch is not ready\n");
+ } else if (g_ts_data->is_polling == 1) {
+ LOG_ERR("touch is busy\n");
+ } else {
+ g_ts_data->is_polling = 1;
+ schedule_work(&g_ts_data->ft5406_work);
+ }
+ g_mcu_ready = 1;
+}
+EXPORT_SYMBOL_GPL(tinker_ft5406_start_polling);
+
+static int tinker_ft5406_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct input_dev *input_dev;
+ int ret = 0;
+
+ g_mcu_ready = 1;
+
+ LOG_INFO("address = 0x%x\n", client->addr);
+
+ g_ts_data = kzalloc(sizeof(struct tinker_ft5406_data), GFP_KERNEL);
+ if (g_ts_data == NULL) {
+ LOG_ERR("no memory for device\n");
+ return -ENOMEM;
+ }
+
+ g_ts_data->client = client;
+ i2c_set_clientdata(client, g_ts_data);
+
+ g_ts_data->screen_width = 800;
+ g_ts_data->screen_height = 480;
+ g_ts_data->xy_reverse = 1;
+
+ LOG_INFO("width = %d, height = %d, reverse = %d\n",
+ g_ts_data->screen_width, g_ts_data->screen_height, g_ts_data->xy_reverse);
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ LOG_ERR("failed to allocate input device\n");
+ goto input_allocate_failed;
+ }
+ input_dev->name = "fts_ts";
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &g_ts_data->client->dev;
+
+ g_ts_data->input_dev = input_dev;
+ input_set_drvdata(input_dev, g_ts_data);
+
+ __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_mt_init_slots(input_dev, MAX_TOUCH_POINTS, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, g_ts_data->screen_width, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, g_ts_data->screen_height, 0, 0);
+
+ ret = input_register_device(input_dev);
+ if (ret) {
+ LOG_ERR("Input device registration failed\n");
+ goto input_register_failed;
+ }
+
+ INIT_WORK(&g_ts_data->ft5406_work, tinker_ft5406_work);
+ if (g_mcu_ready == 1)
+ schedule_work(&g_ts_data->ft5406_work);
+
+ return 0;
+
+input_register_failed:
+ input_free_device(input_dev);
+input_allocate_failed:
+ kfree(g_ts_data);
+ g_ts_data = NULL;
+ return ret;
+}
+
+static int tinker_ft5406_remove(struct i2c_client *client)
+{
+ cancel_work_sync(&g_ts_data->ft5406_work);
+ if (g_ts_data->input_dev) {
+ input_unregister_device(g_ts_data->input_dev);
+ input_free_device(g_ts_data->input_dev);
+ }
+ kfree(g_ts_data);
+ g_ts_data = NULL;
+ g_mcu_ready = 0;
+ return 0;
+}
+
+static const struct i2c_device_id tinker_ft5406_id[] = {
+ {"tinker_ft5406", 0},
+ {},
+};
+
+static struct i2c_driver tinker_ft5406_driver = {
+ .driver = {
+ .name = "tinker_ft5406",
+ },
+ .probe = tinker_ft5406_probe,
+ .remove = tinker_ft5406_remove,
+ .id_table = tinker_ft5406_id,
+};
+module_i2c_driver(tinker_ft5406_driver);
+
+MODULE_DESCRIPTION("TINKER BOARD FT5406 Touch driver");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-starfive.git / commitdiff