--- /dev/null
+/*
+ * cy8c4014/cy8c4024 touch pad driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/delay.h>
+#include <linux/hrtimer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/async.h>
+#include <linux/gpio.h>
+#include <asm/irq.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/proc_fs.h>
+#include <linux/input/mt.h>
+#include "tp_suspend.h"
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/wakelock.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+
+struct cy8c_chipdef {
+ int max_x;
+ int max_y;
+ int multi_touch_num;
+ u8 reg_base;
+};
+
+struct cy8c_touch {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct work_struct work;
+ struct workqueue_struct *wq;
+ int irq;
+ struct tp_device tp;
+ const struct cy8c_chipdef *cdef;
+};
+
+static const struct cy8c_chipdef cy8c4014_data = {
+ .max_x = 0xfe,
+ .max_y = 0xfe, /* only have x axis */
+ .multi_touch_num = 1,
+ .reg_base = 0x00,
+};
+
+static u32 i2c_cy8ctouch_read(struct cy8c_touch *ts, u8 *buf, u32 num)
+{
+ struct i2c_client *client = ts->client;
+ u8 reg = ts->cdef->reg_base;
+ struct i2c_msg xfer_msg[2];
+ int ret;
+
+ xfer_msg[0].addr = client->addr;
+ xfer_msg[0].len = 1;
+ xfer_msg[0].flags = 0;
+ xfer_msg[0].buf = ®
+
+ xfer_msg[1].addr = client->addr;
+ xfer_msg[1].len = num;
+ xfer_msg[1].flags |= I2C_M_RD;
+ xfer_msg[1].buf = buf;
+
+ ret = i2c_transfer(client->adapter, xfer_msg, ARRAY_SIZE(xfer_msg));
+
+ if (ret != ARRAY_SIZE(xfer_msg))
+ return ret;
+
+ return 0;
+}
+
+static irqreturn_t cy8ctouch_irq(int irq, void *dev_id)
+{
+ struct cy8c_touch *ts = (struct cy8c_touch *)dev_id;
+
+ disable_irq_nosync(ts->irq);
+ queue_work(ts->wq, &ts->work);
+
+ return IRQ_HANDLED;
+}
+
+static void cy8ctouch_ts_worker(struct work_struct *work)
+{
+ struct cy8c_touch *ts = container_of(work, struct cy8c_touch, work);
+ struct i2c_client *client = ts->client;
+ const struct cy8c_chipdef *cdef = ts->cdef;
+ int rc;
+ struct {
+ u8 cur_x;
+ u8 cur_y;
+ } pos;
+
+ rc = i2c_cy8ctouch_read(ts, (u8 *)&pos, sizeof(pos));
+ if (rc != 0) {
+ dev_err(&client->dev, "i2c read failed, ret = %d, line:%d\n",
+ rc, __LINE__);
+ enable_irq(ts->irq);
+ return;
+ }
+
+ if (pos.cur_x <= cdef->max_x && pos.cur_y <= cdef->max_y) {
+ /* finger down */
+ dev_dbg(&client->dev, "Touch down, position is %d : %d\n",
+ pos.cur_x, pos.cur_y);
+ input_report_abs(ts->input, ABS_X, pos.cur_x);
+ input_report_abs(ts->input, ABS_Y, pos.cur_y);
+ input_report_key(ts->input, BTN_TOUCH, 1);
+ input_sync(ts->input);
+ } else if (pos.cur_x == 0xff && pos.cur_y == 0xff) {
+ /* finger up */
+ dev_dbg(&client->dev, "Touch up, position is %d : %d\n",
+ pos.cur_x, pos.cur_y);
+ input_report_key(ts->input, BTN_TOUCH, 0);
+ input_sync(ts->input);
+ }
+ enable_irq(ts->irq);
+}
+
+static int cy8ctouch_init(struct i2c_client *client, struct cy8c_touch *ts)
+{
+ struct input_dev *input_device;
+ int rc = 0;
+
+ INIT_WORK(&ts->work, cy8ctouch_ts_worker);
+ ts->wq = create_singlethread_workqueue("cy8c_touchpad_wq");
+ if (!ts->wq) {
+ dev_err(&client->dev, "Create workqueue failed!\n");
+ return -ENOMEM;
+ }
+
+ input_device = devm_input_allocate_device(&ts->client->dev);
+ if (!input_device) {
+ dev_err(&client->dev, "Allocate input device failed!\n");
+ destroy_workqueue(ts->wq);
+ return -ENOMEM;
+ }
+
+ ts->input = input_device;
+ input_device->name = "cy8c_touchpad";
+ input_device->id.bustype = BUS_I2C;
+ input_device->dev.parent = &client->dev;
+ input_set_drvdata(input_device, ts);
+
+ __set_bit(EV_ABS, input_device->evbit);
+ __set_bit(EV_KEY, input_device->evbit);
+ __set_bit(BTN_TOUCH, input_device->keybit);
+
+ if (ts->cdef->max_x > 0) {
+ __set_bit(ABS_X, input_device->absbit);
+ input_set_abs_params(input_device,
+ ABS_X, 0, ts->cdef->max_x, 0, 0);
+ } else {
+ dev_err(&client->dev, "max_x is zero, touchpad don't have x axis\n");
+ }
+
+ if (ts->cdef->max_y > 0) {
+ __set_bit(ABS_Y, input_device->absbit);
+ input_set_abs_params(input_device,
+ ABS_Y, 0, ts->cdef->max_y, 0, 0);
+ } else {
+ dev_err(&client->dev, "max_y is zero, touchpad don't have y axis\n");
+ }
+
+ rc = input_register_device(input_device);
+ if (rc)
+ goto error_unreg_device;
+
+ return 0;
+
+error_unreg_device:
+ destroy_workqueue(ts->wq);
+ return rc;
+}
+
+static int cy8ctouch_suspend(struct tp_device *tp_dev)
+{
+ struct cy8c_touch *ts = container_of(tp_dev, struct cy8c_touch, tp);
+
+ dev_info(&ts->client->dev, "[cy8ctouch] Enter %s\n", __func__);
+
+ return 0;
+}
+
+static int cy8ctouch_resume(struct tp_device *tp_dev)
+{
+ struct cy8c_touch *ts = container_of(tp_dev, struct cy8c_touch, tp);
+
+ dev_info(&ts->client->dev, "[cy8ctouch] Enter %s\n", __func__);
+
+ return 0;
+}
+
+static const struct of_device_id of_cy8ctouch_dt_ids[] = {
+ {.compatible = "cypress,cy8c4014", .data = &cy8c4014_data},
+ {.compatible = "cypress,cy8c4024", .data = &cy8c4014_data},
+ { },
+};
+MODULE_DEVICE_TABLE(of, of_cy8ctouch_dt_ids);
+
+static int
+cy8ctouch_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ const struct of_device_id *of_dev_id;
+ struct device *dev = &client->dev;
+ struct cy8c_touch *ts;
+ int rc;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "cy8ctouch I2C functionality not supported\n");
+ return -ENODEV;
+ }
+
+ of_dev_id = of_match_device(of_cy8ctouch_dt_ids, dev);
+ if (!of_dev_id)
+ return -EINVAL;
+
+ ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->tp.tp_suspend = cy8ctouch_suspend;
+ ts->tp.tp_resume = cy8ctouch_resume;
+ tp_register_fb(&ts->tp);
+
+ ts->client = client;
+ i2c_set_clientdata(client, ts);
+
+ ts->cdef = of_dev_id->data;
+ rc = cy8ctouch_init(client, ts);
+ if (rc < 0) {
+ dev_err(&client->dev, "cy8ctouch init failed\n");
+ goto porbe_err_ret;
+ }
+
+ if (client->irq > 0) {
+ rc = devm_request_irq(dev, client->irq, cy8ctouch_irq, IRQF_TRIGGER_LOW,
+ client->name, ts);
+ if (rc < 0) {
+ dev_err(&client->dev, "cy8ctouch_probe: request irq failed\n");
+ goto porbe_err_ret;
+ }
+ }
+
+ return 0;
+
+porbe_err_ret:
+ return rc;
+}
+
+static int cy8ctouch_i2c_remove(struct i2c_client *client)
+{
+ struct cy8c_touch *ts = i2c_get_clientdata(client);
+
+ cancel_work_sync(&ts->work);
+ destroy_workqueue(ts->wq);
+
+ return 0;
+}
+
+static const struct i2c_device_id cy8ctouch_id[] = {
+ { "cy8c4014", 0 },
+ { "cy8c4024", 0 },
+ { },
+};
+
+static struct i2c_driver cy8ctouch_i2c_driver = {
+ .driver = {
+ .name = "cy8c_touchpad",
+ .of_match_table = of_match_ptr(of_cy8ctouch_dt_ids),
+ },
+ .probe = cy8ctouch_i2c_probe,
+ .remove = cy8ctouch_i2c_remove,
+ .id_table = cy8ctouch_id,
+};
+
+module_i2c_driver(cy8ctouch_i2c_driver);
+
+MODULE_AUTHOR("Wenping Zhang <zwp@rock-chips.com>");
+MODULE_DESCRIPTION("Cypress Cy8cxxxx touchpad driver");
+MODULE_LICENSE("GPL v2");
projects / firefly-linux-kernel-4.4.55.git / commitdiff