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Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
220 lines
4.9 KiB
C
220 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for I2C connected EETI EXC3000 multiple touch controller
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*
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* Copyright (C) 2017 Ahmet Inan <inan@distec.de>
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*
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* minimal implementation based on egalax_ts.c and egalax_i2c.c
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*/
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#include <linux/bitops.h>
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#include <linux/device.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/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/timer.h>
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#include <asm/unaligned.h>
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#define EXC3000_NUM_SLOTS 10
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#define EXC3000_SLOTS_PER_FRAME 5
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#define EXC3000_LEN_FRAME 66
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#define EXC3000_LEN_POINT 10
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#define EXC3000_MT_EVENT 6
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#define EXC3000_TIMEOUT_MS 100
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struct exc3000_data {
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struct i2c_client *client;
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struct input_dev *input;
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struct touchscreen_properties prop;
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struct timer_list timer;
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u8 buf[2 * EXC3000_LEN_FRAME];
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};
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static void exc3000_report_slots(struct input_dev *input,
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struct touchscreen_properties *prop,
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const u8 *buf, int num)
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{
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for (; num--; buf += EXC3000_LEN_POINT) {
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if (buf[0] & BIT(0)) {
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input_mt_slot(input, buf[1]);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
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touchscreen_report_pos(input, prop,
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get_unaligned_le16(buf + 2),
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get_unaligned_le16(buf + 4),
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true);
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}
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}
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}
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static void exc3000_timer(struct timer_list *t)
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{
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struct exc3000_data *data = from_timer(data, t, timer);
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input_mt_sync_frame(data->input);
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input_sync(data->input);
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}
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static int exc3000_read_frame(struct i2c_client *client, u8 *buf)
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{
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int ret;
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ret = i2c_master_send(client, "'", 2);
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if (ret < 0)
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return ret;
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if (ret != 2)
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return -EIO;
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ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
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if (ret < 0)
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return ret;
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if (ret != EXC3000_LEN_FRAME)
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return -EIO;
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if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME ||
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buf[2] != EXC3000_MT_EVENT)
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return -EINVAL;
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return 0;
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}
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static int exc3000_read_data(struct i2c_client *client,
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u8 *buf, int *n_slots)
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{
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int error;
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error = exc3000_read_frame(client, buf);
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if (error)
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return error;
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*n_slots = buf[3];
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if (!*n_slots || *n_slots > EXC3000_NUM_SLOTS)
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return -EINVAL;
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if (*n_slots > EXC3000_SLOTS_PER_FRAME) {
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/* Read 2nd frame to get the rest of the contacts. */
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error = exc3000_read_frame(client, buf + EXC3000_LEN_FRAME);
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if (error)
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return error;
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/* 2nd chunk must have number of contacts set to 0. */
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if (buf[EXC3000_LEN_FRAME + 3] != 0)
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return -EINVAL;
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}
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return 0;
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}
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static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
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{
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struct exc3000_data *data = dev_id;
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struct input_dev *input = data->input;
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u8 *buf = data->buf;
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int slots, total_slots;
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int error;
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error = exc3000_read_data(data->client, buf, &total_slots);
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if (error) {
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/* Schedule a timer to release "stuck" contacts */
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mod_timer(&data->timer,
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jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
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goto out;
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}
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/*
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* We read full state successfully, no contacts will be "stuck".
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*/
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del_timer_sync(&data->timer);
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while (total_slots > 0) {
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slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
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exc3000_report_slots(input, &data->prop, buf + 4, slots);
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total_slots -= slots;
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buf += EXC3000_LEN_FRAME;
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}
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input_mt_sync_frame(input);
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input_sync(input);
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out:
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return IRQ_HANDLED;
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}
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static int exc3000_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct exc3000_data *data;
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struct input_dev *input;
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int error;
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data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->client = client;
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timer_setup(&data->timer, exc3000_timer, 0);
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input = devm_input_allocate_device(&client->dev);
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if (!input)
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return -ENOMEM;
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data->input = input;
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input->name = "EETI EXC3000 Touch Screen";
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input->id.bustype = BUS_I2C;
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
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touchscreen_parse_properties(input, true, &data->prop);
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error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
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INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
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if (error)
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return error;
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error = input_register_device(input);
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if (error)
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return error;
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error = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, exc3000_interrupt, IRQF_ONESHOT,
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client->name, data);
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if (error)
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return error;
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return 0;
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}
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static const struct i2c_device_id exc3000_id[] = {
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{ "exc3000", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, exc3000_id);
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#ifdef CONFIG_OF
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static const struct of_device_id exc3000_of_match[] = {
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{ .compatible = "eeti,exc3000" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, exc3000_of_match);
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#endif
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static struct i2c_driver exc3000_driver = {
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.driver = {
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.name = "exc3000",
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.of_match_table = of_match_ptr(exc3000_of_match),
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},
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.id_table = exc3000_id,
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.probe = exc3000_probe,
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};
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module_i2c_driver(exc3000_driver);
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MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
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MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
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MODULE_LICENSE("GPL v2");
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