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linux/drivers/input/keyboard/qt1070.c
Thomas Gleixner 74ba9207e1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 
Based on 1 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 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 you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  675 mass ave cambridge ma 02139 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 441 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:36:45 +02:00

288 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Atmel AT42QT1070 QTouch Sensor Controller
*
* Copyright (C) 2011 Atmel
*
* Authors: Bo Shen <voice.shen@atmel.com>
*
* Base on AT42QT2160 driver by:
* Raphael Derosso Pereira <raphaelpereira@gmail.com>
* Copyright (C) 2009
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/delay.h>
/* Address for each register */
#define CHIP_ID 0x00
#define QT1070_CHIP_ID 0x2E
#define FW_VERSION 0x01
#define QT1070_FW_VERSION 0x15
#define DET_STATUS 0x02
#define KEY_STATUS 0x03
/* Calibrate */
#define CALIBRATE_CMD 0x38
#define QT1070_CAL_TIME 200
/* Reset */
#define RESET 0x39
#define QT1070_RESET_TIME 255
/* AT42QT1070 support up to 7 keys */
static const unsigned short qt1070_key2code[] = {
KEY_0, KEY_1, KEY_2, KEY_3,
KEY_4, KEY_5, KEY_6,
};
struct qt1070_data {
struct i2c_client *client;
struct input_dev *input;
unsigned int irq;
unsigned short keycodes[ARRAY_SIZE(qt1070_key2code)];
u8 last_keys;
};
static int qt1070_read(struct i2c_client *client, u8 reg)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev,
"can not read register, returned %d\n", ret);
return ret;
}
static int qt1070_write(struct i2c_client *client, u8 reg, u8 data)
{
int ret;
ret = i2c_smbus_write_byte_data(client, reg, data);
if (ret < 0)
dev_err(&client->dev,
"can not write register, returned %d\n", ret);
return ret;
}
static bool qt1070_identify(struct i2c_client *client)
{
int id, ver;
/* Read Chip ID */
id = qt1070_read(client, CHIP_ID);
if (id != QT1070_CHIP_ID) {
dev_err(&client->dev, "ID %d not supported\n", id);
return false;
}
/* Read firmware version */
ver = qt1070_read(client, FW_VERSION);
if (ver < 0) {
dev_err(&client->dev, "could not read the firmware version\n");
return false;
}
dev_info(&client->dev, "AT42QT1070 firmware version %x\n", ver);
return true;
}
static irqreturn_t qt1070_interrupt(int irq, void *dev_id)
{
struct qt1070_data *data = dev_id;
struct i2c_client *client = data->client;
struct input_dev *input = data->input;
int i;
u8 new_keys, keyval, mask = 0x01;
/* Read the detected status register, thus clearing interrupt */
qt1070_read(client, DET_STATUS);
/* Read which key changed */
new_keys = qt1070_read(client, KEY_STATUS);
for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) {
keyval = new_keys & mask;
if ((data->last_keys & mask) != keyval)
input_report_key(input, data->keycodes[i], keyval);
mask <<= 1;
}
input_sync(input);
data->last_keys = new_keys;
return IRQ_HANDLED;
}
static int qt1070_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct qt1070_data *data;
struct input_dev *input;
int i;
int err;
err = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE);
if (!err) {
dev_err(&client->dev, "%s adapter not supported\n",
dev_driver_string(&client->adapter->dev));
return -ENODEV;
}
if (!client->irq) {
dev_err(&client->dev, "please assign the irq to this device\n");
return -EINVAL;
}
/* Identify the qt1070 chip */
if (!qt1070_identify(client))
return -ENODEV;
data = kzalloc(sizeof(struct qt1070_data), GFP_KERNEL);
input = input_allocate_device();
if (!data || !input) {
dev_err(&client->dev, "insufficient memory\n");
err = -ENOMEM;
goto err_free_mem;
}
data->client = client;
data->input = input;
data->irq = client->irq;
input->name = "AT42QT1070 QTouch Sensor";
input->dev.parent = &client->dev;
input->id.bustype = BUS_I2C;
/* Add the keycode */
input->keycode = data->keycodes;
input->keycodesize = sizeof(data->keycodes[0]);
input->keycodemax = ARRAY_SIZE(qt1070_key2code);
__set_bit(EV_KEY, input->evbit);
for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) {
data->keycodes[i] = qt1070_key2code[i];
__set_bit(qt1070_key2code[i], input->keybit);
}
/* Calibrate device */
qt1070_write(client, CALIBRATE_CMD, 1);
msleep(QT1070_CAL_TIME);
/* Soft reset */
qt1070_write(client, RESET, 1);
msleep(QT1070_RESET_TIME);
err = request_threaded_irq(client->irq, NULL, qt1070_interrupt,
IRQF_TRIGGER_NONE | IRQF_ONESHOT,
client->dev.driver->name, data);
if (err) {
dev_err(&client->dev, "fail to request irq\n");
goto err_free_mem;
}
/* Register the input device */
err = input_register_device(data->input);
if (err) {
dev_err(&client->dev, "Failed to register input device\n");
goto err_free_irq;
}
i2c_set_clientdata(client, data);
/* Read to clear the chang line */
qt1070_read(client, DET_STATUS);
return 0;
err_free_irq:
free_irq(client->irq, data);
err_free_mem:
input_free_device(input);
kfree(data);
return err;
}
static int qt1070_remove(struct i2c_client *client)
{
struct qt1070_data *data = i2c_get_clientdata(client);
/* Release IRQ */
free_irq(client->irq, data);
input_unregister_device(data->input);
kfree(data);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int qt1070_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct qt1070_data *data = i2c_get_clientdata(client);
if (device_may_wakeup(dev))
enable_irq_wake(data->irq);
return 0;
}
static int qt1070_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct qt1070_data *data = i2c_get_clientdata(client);
if (device_may_wakeup(dev))
disable_irq_wake(data->irq);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(qt1070_pm_ops, qt1070_suspend, qt1070_resume);
static const struct i2c_device_id qt1070_id[] = {
{ "qt1070", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, qt1070_id);
#ifdef CONFIG_OF
static const struct of_device_id qt1070_of_match[] = {
{ .compatible = "qt1070", },
{ },
};
MODULE_DEVICE_TABLE(of, qt1070_of_match);
#endif
static struct i2c_driver qt1070_driver = {
.driver = {
.name = "qt1070",
.of_match_table = of_match_ptr(qt1070_of_match),
.pm = &qt1070_pm_ops,
},
.id_table = qt1070_id,
.probe = qt1070_probe,
.remove = qt1070_remove,
};
module_i2c_driver(qt1070_driver);
MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
MODULE_DESCRIPTION("Driver for AT42QT1070 QTouch sensor");
MODULE_LICENSE("GPL");
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