--- /dev/null
+/*
+ * Driver for EETI eGalax Multiple Touch Controller
+ *
+ * Copyright (C) 2011 Freescale Semiconductor, Inc.
+ *
+ * based on max11801_ts.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* EETI eGalax serial touch screen controller is a I2C based multiple
+ * touch screen controller, it supports 5 point multiple touch. */
+
+/* TODO:
+ - auto idle mode support
+*/
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/input/mt.h>
+#include <linux/of_gpio.h>
+
+/*
+ * Mouse Mode: some panel may configure the controller to mouse mode,
+ * which can only report one point at a given time.
+ * This driver will ignore events in this mode.
+ */
+#define REPORT_MODE_MOUSE 0x1
+/*
+ * Vendor Mode: this mode is used to transfer some vendor specific
+ * messages.
+ * This driver will ignore events in this mode.
+ */
+#define REPORT_MODE_VENDOR 0x3
+/* Multiple Touch Mode */
+#define REPORT_MODE_MTTOUCH 0x4
+
+#define MAX_SUPPORT_POINTS 5
+
+#define EVENT_VALID_OFFSET 7
+#define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET)
+#define EVENT_ID_OFFSET 2
+#define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET)
+#define EVENT_IN_RANGE (0x1 << 1)
+#define EVENT_DOWN_UP (0X1 << 0)
+
+#define MAX_I2C_DATA_LEN 10
+
+#define EGALAX_MAX_X 32760
+#define EGALAX_MAX_Y 32760
+#define EGALAX_MAX_TRIES 100
+
+struct egalax_ts {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+};
+
+static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
+{
+ struct egalax_ts *ts = dev_id;
+ struct input_dev *input_dev = ts->input_dev;
+ struct i2c_client *client = ts->client;
+ u8 buf[MAX_I2C_DATA_LEN];
+ int id, ret, x, y, z;
+ int tries = 0;
+ bool down, valid;
+ u8 state;
+
+ do {
+ ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN);
+ } while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES);
+
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ if (buf[0] != REPORT_MODE_MTTOUCH) {
+ /* ignore mouse events and vendor events */
+ return IRQ_HANDLED;
+ }
+
+ state = buf[1];
+ x = (buf[3] << 8) | buf[2];
+ y = (buf[5] << 8) | buf[4];
+ z = (buf[7] << 8) | buf[6];
+
+ valid = state & EVENT_VALID_MASK;
+ id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET;
+ down = state & EVENT_DOWN_UP;
+
+ if (!valid || id > MAX_SUPPORT_POINTS) {
+ dev_dbg(&client->dev, "point invalid\n");
+ return IRQ_HANDLED;
+ }
+
+ input_mt_slot(input_dev, id);
+ input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down);
+
+ dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d",
+ down ? "down" : "up", id, x, y, z);
+
+ if (down) {
+ input_report_abs(input_dev, ABS_MT_POSITION_X, x);
+ input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
+ input_report_abs(input_dev, ABS_MT_PRESSURE, z);
+ }
+
+ input_mt_report_pointer_emulation(input_dev, true);
+ input_sync(input_dev);
+
+ return IRQ_HANDLED;
+}
+
+/* wake up controller by an falling edge of interrupt gpio. */
+static int egalax_wake_up_device(struct i2c_client *client)
+{
+ struct device_node *np = client->dev.of_node;
+ int gpio;
+ int ret;
+
+ if (!np)
+ return -ENODEV;
+
+ gpio = of_get_named_gpio(np, "wakeup-gpios", 0);
+ if (!gpio_is_valid(gpio))
+ return -ENODEV;
+
+ ret = gpio_request(gpio, "egalax_irq");
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "request gpio failed, cannot wake up controller: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* wake up controller via an falling edge on IRQ gpio. */
+ gpio_direction_output(gpio, 0);
+ gpio_set_value(gpio, 1);
+
+ /* controller should be waken up, return irq. */
+ gpio_direction_input(gpio);
+ gpio_free(gpio);
+
+ return 0;
+}
+
+static int egalax_firmware_version(struct i2c_client *client)
+{
+ static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 };
+ int ret;
+
+ ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int egalax_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct egalax_ts *ts;
+ struct input_dev *input_dev;
+ int error;
+
+ ts = devm_kzalloc(&client->dev, sizeof(struct egalax_ts), GFP_KERNEL);
+ if (!ts) {
+ dev_err(&client->dev, "Failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ input_dev = devm_input_allocate_device(&client->dev);
+ if (!input_dev) {
+ dev_err(&client->dev, "Failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ ts->client = client;
+ ts->input_dev = input_dev;
+
+ /* controller may be in sleep, wake it up. */
+ error = egalax_wake_up_device(client);
+ if (error) {
+ dev_err(&client->dev, "Failed to wake up the controller\n");
+ return error;
+ }
+
+ error = egalax_firmware_version(client);
+ if (error < 0) {
+ dev_err(&client->dev, "Failed to read firmware version\n");
+ return error;
+ }
+
+ input_dev->name = "EETI eGalax Touch Screen";
+ input_dev->id.bustype = BUS_I2C;
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(BTN_TOUCH, input_dev->keybit);
+
+ input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0);
+ input_set_abs_params(input_dev,
+ ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0);
+ input_set_abs_params(input_dev,
+ ABS_MT_POSITION_Y, 0, EGALAX_MAX_Y, 0, 0);
+ input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0);
+
+ input_set_drvdata(input_dev, ts);
+
+ error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ egalax_ts_interrupt,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "egalax_ts", ts);
+ if (error < 0) {
+ dev_err(&client->dev, "Failed to register interrupt\n");
+ return error;
+ }
+
+ error = input_register_device(ts->input_dev);
+ if (error)
+ return error;
+
+ i2c_set_clientdata(client, ts);
+ return 0;
+}
+
+static const struct i2c_device_id egalax_ts_id[] = {
+ { "egalax_ts", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
+
+static int __maybe_unused egalax_ts_suspend(struct device *dev)
+{
+ static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = {
+ 0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0
+ };
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret;
+
+ ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
+ return ret > 0 ? 0 : ret;
+}
+
+static int __maybe_unused egalax_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return egalax_wake_up_device(client);
+}
+
+static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);
+
+static const struct of_device_id egalax_ts_dt_ids[] = {
+ { .compatible = "eeti,egalax_ts" },
+ { /* sentinel */ }
+};
+
+static struct i2c_driver egalax_ts_driver = {
+ .driver = {
+ .name = "egalax_ts",
+ .owner = THIS_MODULE,
+ .pm = &egalax_ts_pm_ops,
+ .of_match_table = egalax_ts_dt_ids,
+ },
+ .id_table = egalax_ts_id,
+ .probe = egalax_ts_probe,
+};
+
+module_i2c_driver(egalax_ts_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff