/*
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*
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* Raspberry Pi 7 inch Touchscreen FT5426 touch driver.
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*
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* Copyright (c) 2016 ASUSTek Computer Inc.
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* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include "raspits_ft5426.h"
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static int fts_i2c_read(struct i2c_client *client, char *writebuf,
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int writelen, char *readbuf, int readlen)
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{
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int ret;
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if (writelen > 0) {
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = writelen,
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.buf = writebuf,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = readlen,
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.buf = readbuf,
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},
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};
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ret = i2c_transfer(client->adapter, msgs, 2);
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if (ret < 0)
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LOG_ERR("i2c read error, %d\n", ret);
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} else {
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struct i2c_msg msgs[] = {
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = readlen,
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.buf = readbuf,
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},
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};
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ret = i2c_transfer(client->adapter, msgs, 1);
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if (ret < 0)
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LOG_ERR("i2c read error, %d\n", ret);
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}
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return ret;
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}
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static int fts_read_reg(struct i2c_client *client, u8 addr, u8 *val)
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{
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return fts_i2c_read(client, &addr, 1, val, 1);
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}
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static int fts_check_fw_ver(struct i2c_client *client)
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{
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u8 reg_addr, fw_ver[3];
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int ret;
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reg_addr = FT_REG_FW_VER;
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ret = fts_i2c_read(client, ®_addr, 1, &fw_ver[0], 1);
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if (ret < 0)
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goto error;
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reg_addr = FT_REG_FW_MIN_VER;
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ret = fts_i2c_read(client, ®_addr, 1, &fw_ver[1], 1);
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if (ret < 0)
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goto error;
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reg_addr = FT_REG_FW_SUB_MIN_VER;
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ret = fts_i2c_read(client, ®_addr, 1, &fw_ver[2], 1);
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if (ret < 0)
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goto error;
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LOG_INFO("Firmware version = %d.%d.%d\n", fw_ver[0], fw_ver[1], fw_ver[2]);
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return 0;
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error:
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return ret;
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}
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static int fts_read_td_status(struct raspits_ft5426_data *ts_data)
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{
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u8 td_status;
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int ret = -1;
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ret = fts_read_reg(ts_data->client, FT_TD_STATUS_REG, &td_status);
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if (ret < 0) {
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LOG_ERR("get reg td_status failed, %d\n", ret);
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return ret;
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}
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return (int)td_status;
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}
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static int fts_read_touchdata(struct raspits_ft5426_data *ts_data)
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{
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struct ts_event *event = &ts_data->event;
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int ret = -1, i;
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u8 buf[FT_ONE_TCH_LEN-2] = { 0 };
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u8 reg_addr, pointid = FT_MAX_ID;
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for (i = 0; i < event->touch_point && i < MAX_TOUCH_POINTS; i++) {
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reg_addr = FT_TOUCH_X_H_REG + (i * FT_ONE_TCH_LEN);
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ret = fts_i2c_read(ts_data->client, ®_addr, 1, buf, FT_ONE_TCH_LEN-2);
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if (ret < 0) {
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LOG_ERR("read touchdata failed.\n");
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return ret;
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}
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pointid = (buf[FT_TOUCH_ID]) >> 4;
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if (pointid >= MAX_TOUCH_POINTS)
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break;
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event->au8_finger_id[i] = pointid;
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event->au16_x[i] = (s16) (buf[FT_TOUCH_X_H] & 0x0F) << 8 | (s16) buf[FT_TOUCH_X_L];
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event->au16_y[i] = (s16) (buf[FT_TOUCH_Y_H] & 0x0F) << 8 | (s16) buf[FT_TOUCH_Y_L];
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event->au8_touch_event[i] = buf[FT_TOUCH_EVENT] >> 6;
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#if XY_REVERSE
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event->au16_x[i] = SCREEN_WIDTH - event->au16_x[i] - 1;
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event->au16_y[i] = SCREEN_HEIGHT - event->au16_y[i] - 1;
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#endif
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}
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event->pressure = FT_PRESS;
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return 0;
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}
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static void fts_report_value(struct raspits_ft5426_data *ts_data)
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{
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struct ts_event *event = &ts_data->event;
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int i, modified_ids = 0, released_ids;
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for (i = 0; i < event->touch_point && i < MAX_TOUCH_POINTS; i++) {
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if (event->au8_touch_event[i]== FT_TOUCH_DOWN
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|| event->au8_touch_event[i] == FT_TOUCH_CONTACT)
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{
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modified_ids |= 1 << event->au8_finger_id[i];
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input_mt_slot(ts_data->input_dev, event->au8_finger_id[i]);
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input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER,
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true);
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input_report_abs(ts_data->input_dev, ABS_MT_TOUCH_MAJOR,
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event->pressure);
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input_report_abs(ts_data->input_dev, ABS_MT_POSITION_X,
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event->au16_x[i]);
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input_report_abs(ts_data->input_dev, ABS_MT_POSITION_Y,
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event->au16_y[i]);
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if(!((1 << event->au8_finger_id[i]) & ts_data->known_ids))
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LOG_DBG("Touch id-%d: x = %d, y = %d\n",
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event->au8_finger_id[i], event->au16_x[i], event->au16_y[i]);
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}
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}
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released_ids = ts_data->known_ids & ~modified_ids;
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for(i = 0; released_ids && i < MAX_TOUCH_POINTS; i++) {
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if(released_ids & (1<<i)) {
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LOG_DBG("Release id-%d, known = %x modified = %x\n", i, ts_data->known_ids, modified_ids);
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input_mt_slot(ts_data->input_dev, i);
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input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER, false);
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modified_ids &= ~(1 << i);
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}
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}
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ts_data->known_ids = modified_ids;
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input_mt_report_pointer_emulation(ts_data->input_dev, true);
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input_sync(ts_data->input_dev);
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}
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static void raspits_ft5426_work(struct work_struct *work)
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{
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struct raspits_ft5426_data *ts_data
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= container_of(work, struct raspits_ft5426_data, ft5426_work);
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struct ts_event *event = &ts_data->event;
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int ret = 0, count = 8, td_status;
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while(count > 0) {
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ret = fts_check_fw_ver(ts_data->client);
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if (ret == 0)
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break;
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LOG_INFO("checking touch ic, countdown: %d\n", count);
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msleep(1000);
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count--;
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}
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if (!count) {
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LOG_ERR("checking touch ic timeout, %d\n", ret);
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return;
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}
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//polling 60fps
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while(1) {
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td_status = fts_read_td_status(ts_data);
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if (td_status < VALID_TD_STATUS_VAL+1 && (td_status > 0 || ts_data->known_ids != 0)) {
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memset(event, -1, sizeof(struct ts_event));
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event->touch_point = td_status;
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ret = fts_read_touchdata(ts_data);
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if (ret == 0)
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fts_report_value(ts_data);
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}
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msleep_interruptible(17);
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}
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}
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static int raspits_ft5426_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct raspits_ft5426_data *ts_data;
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struct input_dev *input_dev;
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int ret = 0;//, timeout = 10;
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LOG_INFO("address = 0x%x\n", client->addr);
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ts_data = kzalloc(sizeof(struct raspits_ft5426_data), GFP_KERNEL);
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if (ts_data == NULL) {
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LOG_ERR("no memory for device\n");
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return -ENOMEM;
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}
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ts_data->client = client;
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i2c_set_clientdata(client, ts_data);
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input_dev = input_allocate_device();
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if (!input_dev) {
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LOG_ERR("failed to allocate input device\n");
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goto input_allocate_failed;
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}
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input_dev->name = "fts_ts";
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input_dev->id.bustype = BUS_I2C;
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input_dev->dev.parent = &ts_data->client->dev;
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ts_data->input_dev = input_dev;
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input_set_drvdata(input_dev, ts_data);
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__set_bit(EV_SYN, input_dev->evbit);
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(EV_ABS, input_dev->evbit);
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__set_bit(BTN_TOUCH, input_dev->keybit);
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input_mt_init_slots(input_dev, MAX_TOUCH_POINTS, 0);
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input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
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SCREEN_WIDTH, 0, 0);
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input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
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SCREEN_HEIGHT, 0, 0);
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ret = input_register_device(input_dev);
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if (ret) {
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LOG_ERR("Input device registration failed\n");
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goto input_register_failed;
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}
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INIT_WORK(&ts_data->ft5426_work, raspits_ft5426_work);
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schedule_work(&ts_data->ft5426_work);
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return 0;
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input_register_failed:
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input_free_device(input_dev);
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input_allocate_failed:
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kfree(ts_data);
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return ret;
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}
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static int raspits_ft5426_remove(struct i2c_client *client)
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{
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struct raspits_ft5426_data *ts_data = i2c_get_clientdata(client);
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cancel_work_sync(&ts_data->ft5426_work);
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if (ts_data->input_dev) {
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input_unregister_device(ts_data->input_dev);
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input_free_device(ts_data->input_dev);
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}
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kfree(ts_data);
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return 0;
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}
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static const struct i2c_device_id raspits_ft5426_id[] = {
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{ "raspits_ft5426", 0 },
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{ },
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};
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static struct i2c_driver raspits_ft5426_driver = {
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.driver = {
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.name = "raspits_ft5426",
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},
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.probe = raspits_ft5426_probe,
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.remove = raspits_ft5426_remove,
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.id_table = raspits_ft5426_id,
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};
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module_i2c_driver(raspits_ft5426_driver);
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MODULE_DESCRIPTION("Raspberry Pi 7 inch Touchscreen FT5426 Touch driver");
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MODULE_LICENSE("GPL v2");
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