--- /dev/null
+/*
+ * Driver for I2C connected EETI EXC3000 multiple touch controller
+ *
+ * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
+ *
+ * minimal implementation based on egalax_ts.c and egalax_i2c.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.
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/timer.h>
+#include <asm/unaligned.h>
+
+#define EXC3000_NUM_SLOTS 10
+#define EXC3000_SLOTS_PER_FRAME 5
+#define EXC3000_LEN_FRAME 66
+#define EXC3000_LEN_POINT 10
+#define EXC3000_MT_EVENT 6
+#define EXC3000_TIMEOUT_MS 100
+
+struct exc3000_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct touchscreen_properties prop;
+ struct timer_list timer;
+ u8 buf[2 * EXC3000_LEN_FRAME];
+};
+
+static void exc3000_report_slots(struct input_dev *input,
+ struct touchscreen_properties *prop,
+ const u8 *buf, int num)
+{
+ for (; num--; buf += EXC3000_LEN_POINT) {
+ if (buf[0] & BIT(0)) {
+ input_mt_slot(input, buf[1]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ touchscreen_report_pos(input, prop,
+ get_unaligned_le16(buf + 2),
+ get_unaligned_le16(buf + 4),
+ true);
+ }
+ }
+}
+
+static void exc3000_timer(struct timer_list *t)
+{
+ struct exc3000_data *data = from_timer(data, t, timer);
+
+ input_mt_sync_frame(data->input);
+ input_sync(data->input);
+}
+
+static int exc3000_read_frame(struct i2c_client *client, u8 *buf)
+{
+ int ret;
+
+ ret = i2c_master_send(client, "'", 2);
+ if (ret < 0)
+ return ret;
+
+ if (ret != 2)
+ return -EIO;
+
+ ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
+ if (ret < 0)
+ return ret;
+
+ if (ret != EXC3000_LEN_FRAME)
+ return -EIO;
+
+ if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME ||
+ buf[2] != EXC3000_MT_EVENT)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int exc3000_read_data(struct i2c_client *client,
+ u8 *buf, int *n_slots)
+{
+ int error;
+
+ error = exc3000_read_frame(client, buf);
+ if (error)
+ return error;
+
+ *n_slots = buf[3];
+ if (!*n_slots || *n_slots > EXC3000_NUM_SLOTS)
+ return -EINVAL;
+
+ if (*n_slots > EXC3000_SLOTS_PER_FRAME) {
+ /* Read 2nd frame to get the rest of the contacts. */
+ error = exc3000_read_frame(client, buf + EXC3000_LEN_FRAME);
+ if (error)
+ return error;
+
+ /* 2nd chunk must have number of contacts set to 0. */
+ if (buf[EXC3000_LEN_FRAME + 3] != 0)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
+{
+ struct exc3000_data *data = dev_id;
+ struct input_dev *input = data->input;
+ u8 *buf = data->buf;
+ int slots, total_slots;
+ int error;
+
+ error = exc3000_read_data(data->client, buf, &total_slots);
+ if (error) {
+ /* Schedule a timer to release "stuck" contacts */
+ mod_timer(&data->timer,
+ jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
+ goto out;
+ }
+
+ /*
+ * We read full state successfully, no contacts will be "stuck".
+ */
+ del_timer_sync(&data->timer);
+
+ while (total_slots > 0) {
+ slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
+ exc3000_report_slots(input, &data->prop, buf + 4, slots);
+ total_slots -= slots;
+ buf += EXC3000_LEN_FRAME;
+ }
+
+ input_mt_sync_frame(input);
+ input_sync(input);
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int exc3000_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct exc3000_data *data;
+ struct input_dev *input;
+ int error;
+
+ data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->client = client;
+ timer_setup(&data->timer, exc3000_timer, 0);
+
+ input = devm_input_allocate_device(&client->dev);
+ if (!input)
+ return -ENOMEM;
+
+ data->input = input;
+
+ input->name = "EETI EXC3000 Touch Screen";
+ input->id.bustype = BUS_I2C;
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
+ touchscreen_parse_properties(input, true, &data->prop);
+
+ error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (error)
+ return error;
+
+ error = input_register_device(input);
+ if (error)
+ return error;
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, exc3000_interrupt, IRQF_ONESHOT,
+ client->name, data);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static const struct i2c_device_id exc3000_id[] = {
+ { "exc3000", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, exc3000_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id exc3000_of_match[] = {
+ { .compatible = "eeti,exc3000" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, exc3000_of_match);
+#endif
+
+static struct i2c_driver exc3000_driver = {
+ .driver = {
+ .name = "exc3000",
+ .of_match_table = of_match_ptr(exc3000_of_match),
+ },
+ .id_table = exc3000_id,
+ .probe = exc3000_probe,
+};
+
+module_i2c_driver(exc3000_driver);
+
+MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
+MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / blogic.git / commitdiff