/*
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* cy8c4014/cy8c4024 touch pad driver
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*
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* Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/hrtimer.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/async.h>
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#include <linux/gpio.h>
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#include <asm/irq.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/proc_fs.h>
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#include <linux/input/mt.h>
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#include "tp_suspend.h"
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/wakelock.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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struct cy8c_chipdef {
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int max_x;
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int max_y;
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int multi_touch_num;
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u8 reg_base;
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};
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struct cy8c_touch {
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struct i2c_client *client;
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struct input_dev *input;
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struct work_struct work;
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struct workqueue_struct *wq;
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int irq;
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struct tp_device tp;
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const struct cy8c_chipdef *cdef;
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};
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static const struct cy8c_chipdef cy8c4014_data = {
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.max_x = 0xfe,
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.max_y = 0xfe, /* only have x axis */
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.multi_touch_num = 1,
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.reg_base = 0x00,
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};
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static u32 i2c_cy8ctouch_read(struct cy8c_touch *ts, u8 *buf, u32 num)
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{
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struct i2c_client *client = ts->client;
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u8 reg = ts->cdef->reg_base;
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struct i2c_msg xfer_msg[2];
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int ret;
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xfer_msg[0].addr = client->addr;
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xfer_msg[0].len = 1;
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xfer_msg[0].flags = 0;
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xfer_msg[0].buf = ®
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xfer_msg[1].addr = client->addr;
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xfer_msg[1].len = num;
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xfer_msg[1].flags = I2C_M_RD;
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xfer_msg[1].buf = buf;
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ret = i2c_transfer(client->adapter, xfer_msg, ARRAY_SIZE(xfer_msg));
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if (ret != ARRAY_SIZE(xfer_msg))
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return ret;
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return 0;
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}
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static irqreturn_t cy8ctouch_irq(int irq, void *dev_id)
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{
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struct cy8c_touch *ts = (struct cy8c_touch *)dev_id;
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disable_irq_nosync(ts->irq);
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queue_work(ts->wq, &ts->work);
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return IRQ_HANDLED;
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}
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static void cy8ctouch_ts_worker(struct work_struct *work)
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{
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struct cy8c_touch *ts = container_of(work, struct cy8c_touch, work);
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struct i2c_client *client = ts->client;
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const struct cy8c_chipdef *cdef = ts->cdef;
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int rc;
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struct {
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u8 cur_x;
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u8 cur_y;
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} pos;
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rc = i2c_cy8ctouch_read(ts, (u8 *)&pos, sizeof(pos));
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if (rc != 0) {
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dev_err(&client->dev, "i2c read failed, ret = %d, line:%d\n",
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rc, __LINE__);
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enable_irq(ts->irq);
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return;
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}
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if (pos.cur_x <= cdef->max_x && pos.cur_y <= cdef->max_y) {
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/* finger down */
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dev_dbg(&client->dev, "Touch down, position is %d : %d\n",
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pos.cur_x, pos.cur_y);
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input_report_abs(ts->input, ABS_X, pos.cur_x);
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input_report_abs(ts->input, ABS_Y, pos.cur_y);
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input_report_key(ts->input, BTN_TOUCH, 1);
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input_sync(ts->input);
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} else if (pos.cur_x == 0xff && pos.cur_y == 0xff) {
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/* finger up */
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dev_dbg(&client->dev, "Touch up, position is %d : %d\n",
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pos.cur_x, pos.cur_y);
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input_report_key(ts->input, BTN_TOUCH, 0);
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input_sync(ts->input);
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}
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enable_irq(ts->irq);
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}
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static int cy8ctouch_init(struct i2c_client *client, struct cy8c_touch *ts)
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{
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struct input_dev *input_device;
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int rc = 0;
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INIT_WORK(&ts->work, cy8ctouch_ts_worker);
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ts->wq = create_singlethread_workqueue("cy8c_touchpad_wq");
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if (!ts->wq) {
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dev_err(&client->dev, "Create workqueue failed!\n");
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return -ENOMEM;
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}
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input_device = devm_input_allocate_device(&ts->client->dev);
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if (!input_device) {
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dev_err(&client->dev, "Allocate input device failed!\n");
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destroy_workqueue(ts->wq);
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return -ENOMEM;
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}
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ts->input = input_device;
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input_device->name = "cy8c_touchpad";
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input_device->id.bustype = BUS_I2C;
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input_device->dev.parent = &client->dev;
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input_set_drvdata(input_device, ts);
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__set_bit(EV_ABS, input_device->evbit);
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__set_bit(EV_KEY, input_device->evbit);
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__set_bit(BTN_TOUCH, input_device->keybit);
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if (ts->cdef->max_x > 0) {
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__set_bit(ABS_X, input_device->absbit);
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input_set_abs_params(input_device,
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ABS_X, 0, ts->cdef->max_x, 0, 0);
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} else {
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dev_err(&client->dev, "max_x is zero, touchpad don't have x axis\n");
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}
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if (ts->cdef->max_y > 0) {
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__set_bit(ABS_Y, input_device->absbit);
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input_set_abs_params(input_device,
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ABS_Y, 0, ts->cdef->max_y, 0, 0);
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} else {
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dev_err(&client->dev, "max_y is zero, touchpad don't have y axis\n");
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}
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rc = input_register_device(input_device);
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if (rc)
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goto error_unreg_device;
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return 0;
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error_unreg_device:
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destroy_workqueue(ts->wq);
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return rc;
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}
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static int cy8ctouch_suspend(struct tp_device *tp_dev)
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{
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struct cy8c_touch *ts = container_of(tp_dev, struct cy8c_touch, tp);
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dev_info(&ts->client->dev, "[cy8ctouch] Enter %s\n", __func__);
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return 0;
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}
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static int cy8ctouch_resume(struct tp_device *tp_dev)
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{
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struct cy8c_touch *ts = container_of(tp_dev, struct cy8c_touch, tp);
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dev_info(&ts->client->dev, "[cy8ctouch] Enter %s\n", __func__);
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return 0;
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}
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static const struct of_device_id of_cy8ctouch_dt_ids[] = {
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{.compatible = "cypress,cy8c4014", .data = &cy8c4014_data},
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{.compatible = "cypress,cy8c4024", .data = &cy8c4014_data},
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{ },
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};
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MODULE_DEVICE_TABLE(of, of_cy8ctouch_dt_ids);
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static int
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cy8ctouch_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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const struct of_device_id *of_dev_id;
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struct device *dev = &client->dev;
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struct cy8c_touch *ts;
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int rc;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "cy8ctouch I2C functionality not supported\n");
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return -ENODEV;
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}
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of_dev_id = of_match_device(of_cy8ctouch_dt_ids, dev);
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if (!of_dev_id)
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return -EINVAL;
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ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->tp.tp_suspend = cy8ctouch_suspend;
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ts->tp.tp_resume = cy8ctouch_resume;
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tp_register_fb(&ts->tp);
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ts->client = client;
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i2c_set_clientdata(client, ts);
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ts->cdef = of_dev_id->data;
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rc = cy8ctouch_init(client, ts);
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if (rc < 0) {
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dev_err(&client->dev, "cy8ctouch init failed\n");
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goto porbe_err_ret;
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}
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if (client->irq > 0) {
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rc = devm_request_irq(dev, client->irq, cy8ctouch_irq, IRQF_TRIGGER_FALLING,
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client->name, ts);
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if (rc < 0) {
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dev_err(&client->dev, "cy8ctouch_probe: request irq failed\n");
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goto porbe_err_ret;
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}
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}
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return 0;
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porbe_err_ret:
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return rc;
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}
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static int cy8ctouch_i2c_remove(struct i2c_client *client)
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{
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struct cy8c_touch *ts = i2c_get_clientdata(client);
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cancel_work_sync(&ts->work);
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destroy_workqueue(ts->wq);
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return 0;
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}
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static const struct i2c_device_id cy8ctouch_id[] = {
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{ "cy8c4014", 0 },
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{ "cy8c4024", 0 },
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{ },
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};
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static struct i2c_driver cy8ctouch_i2c_driver = {
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.driver = {
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.name = "cy8c_touchpad",
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.of_match_table = of_match_ptr(of_cy8ctouch_dt_ids),
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},
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.probe = cy8ctouch_i2c_probe,
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.remove = cy8ctouch_i2c_remove,
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.id_table = cy8ctouch_id,
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};
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module_i2c_driver(cy8ctouch_i2c_driver);
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MODULE_AUTHOR("Wenping Zhang <zwp@rock-chips.com>");
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MODULE_DESCRIPTION("Cypress Cy8cxxxx touchpad driver");
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MODULE_LICENSE("GPL v2");
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