summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/qt1070.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/input/keyboard/qt1070.c')
-rw-r--r--drivers/input/keyboard/qt1070.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/input/keyboard/qt1070.c b/drivers/input/keyboard/qt1070.c
new file mode 100644
index 0000000000..9b093b042b
--- /dev/null
+++ b/drivers/input/keyboard/qt1070.c
@@ -0,0 +1,264 @@
+// 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)
+{
+ 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 = devm_kzalloc(&client->dev, sizeof(struct qt1070_data),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ input = devm_input_allocate_device(&client->dev);
+ if (!input)
+ return -ENOMEM;
+
+ data->client = client;
+ data->input = input;
+ data->irq = client->irq;
+
+ input->name = "AT42QT1070 QTouch Sensor";
+ 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 = devm_request_threaded_irq(&client->dev, 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");
+ return err;
+ }
+
+ /* Register the input device */
+ err = input_register_device(data->input);
+ if (err) {
+ dev_err(&client->dev, "Failed to register input device\n");
+ return err;
+ }
+
+ i2c_set_clientdata(client, data);
+
+ /* Read to clear the chang line */
+ qt1070_read(client, DET_STATUS);
+
+ return 0;
+}
+
+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;
+}
+
+static DEFINE_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 = pm_sleep_ptr(&qt1070_pm_ops),
+ },
+ .id_table = qt1070_id,
+ .probe = qt1070_probe,
+};
+
+module_i2c_driver(qt1070_driver);
+
+MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
+MODULE_DESCRIPTION("Driver for AT42QT1070 QTouch sensor");
+MODULE_LICENSE("GPL");