From: Raphael Derosso Pereira <raphaelpereira@xxxxxxxxx>
Initial version of AT42QT2160 Atmel Sensor Chip support. This version only
supports individual cells (no slide support yet). The code has been tested
on proprietary development ARM board, but should work fine on other machines.
Signed-off-by: Raphael Derosso Pereira <raphaelpereira@xxxxxxxxx>
---
This is my first patch to linux, so please comment.
diff -uprN -X linux-2.6.26/Documentation/dontdiff
original_kernel/linux-2.6.26/drivers/input/keyboard/Kconfig
linux-2.6.26/drivers/input/keyboard/Kconfig
--- original_kernel/linux-2.6.26/drivers/input/keyboard/Kconfig 2008-07-13
18:51:29.000000000 -0300
+++ linux-2.6.26/drivers/input/keyboard/Kconfig 2009-08-18
17:25:20.476740835 -0300
@@ -268,6 +268,17 @@ config KEYBOARD_PXA27x
To compile this driver as a module, choose M here: the
module will be called pxa27x_keypad.
+config QT2160
+ tristate "Atmel AT42QT2160 Touch Sensor Chip"
+ depends on EXPERIMENTAL
+ select I2C
+ help
+ If you say yes here you get support for Atmel AT42QT2160 Touch
+ Sensor chip as a keyboard input.
+
+ This driver can also be built as a module. If so, the module
+ will be called qt2160.
+
config KEYBOARD_AAED2000
tristate "AAED-2000 keyboard"
depends on MACH_AAED2000
diff -uprN -X linux-2.6.26/Documentation/dontdiff
original_kernel/linux-2.6.26/drivers/input/keyboard/Makefile
linux-2.6.26/drivers/input/keyboard/Makefile
--- original_kernel/linux-2.6.26/drivers/input/keyboard/Makefile 2008-07-13
18:51:29.000000000 -0300
+++ linux-2.6.26/drivers/input/keyboard/Makefile 2009-08-18
17:25:51.313058161 -0300
@@ -20,6 +20,7 @@ obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
obj-$(CONFIG_KEYBOARD_PXA27x) += pxa27x_keypad.o
+obj-$(CONFIG_QT2160) += qt2160.o
obj-$(CONFIG_KEYBOARD_AAED2000) += aaed2000_kbd.o
obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
obj-$(CONFIG_KEYBOARD_HP6XX) += jornada680_kbd.o
diff -uprN -X linux-2.6.26/Documentation/dontdiff
original_kernel/linux-2.6.26/drivers/input/keyboard/qt2160.c
linux-2.6.26/drivers/input/keyboard/qt2160.c
--- original_kernel/linux-2.6.26/drivers/input/keyboard/qt2160.c 1969-12-31
21:00:00.000000000 -0300
+++ linux-2.6.26/drivers/input/keyboard/qt2160.c 2009-08-20
17:06:35.400982962 -0300
@@ -0,0 +1,394 @@
+/*
+ qt2160.c - Atmel AT42QT2160 Touch Sense Controller
+
+ Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@xxxxxxxxx>
+
+ 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.
+*/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/mutex.h>
+
+#define QT2160_VALID_CHIPID (0x11)
+
+#define QT2160_CMD_CHIPID (00)
+#define QT2160_CMD_CODEVER (01)
+#define QT2160_CMD_GSTAT (02)
+#define QT2160_CMD_KEYS3 (03)
+#define QT2160_CMD_KEYS4 (04)
+#define QT2160_CMD_SLIDE (05)
+#define QT2160_CMD_GPIOS (06)
+#define QT2160_CMD_SUBVER (07)
+#define QT2160_CMD_CALIBRATE (10)
+
+#define QT2160_CYCLE_INTERVAL (HZ)
+
+static unsigned char qt2160_key2code[] = {
+ KEY_0, KEY_1, KEY_2, KEY_3,
+ KEY_4, KEY_5, KEY_6, KEY_7,
+ KEY_8, KEY_9, KEY_A, KEY_B,
+ KEY_C, KEY_D, KEY_E, KEY_F,
+};
+
+struct qt2160_data {
+ struct mutex mlock;
+ struct i2c_client *client;
+ struct delayed_work handle_work;
+ struct work_struct handle_irq_work;
+ struct input_dev *input;
+ u8 version_major;
+ u8 version_minor;
+ u8 version_rev;
+ u16 key_matrix;
+};
+
+static int qt2160_read(struct i2c_client *client, u8 reg)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte(client, reg);
+ if (ret) {
+ dev_err(&client->dev,
+ "couldn't send request. Returned %d\n", ret);
+ return ret;
+ }
+
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "couldn't read register. Returned %d\n", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
+static int qt2160_write(struct i2c_client *client, u8 reg, u8 data)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte(client, reg);
+ if (ret) {
+ dev_err(&client->dev,
+ "couldn't send request. Returned %d\n", ret);
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte(client, data);
+ if (ret) {
+ dev_err(&client->dev,
+ "couldn't write data. Returned %d\n", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
+static int qt2160_get_key_matrix(struct i2c_client *client)
+{
+ int ret, i;
+ struct qt2160_data *qt2160;
+ u16 old_matrix;
+
+ dev_dbg(&client->dev, "requesting keys...\n");
+ qt2160 = i2c_get_clientdata(client);
+ mutex_lock(&qt2160->mlock);
+
+ /* Read General Status Register */
+ ret = qt2160_read(client, QT2160_CMD_GSTAT);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "could not get general status register\n");
+ goto err_unlock;
+ }
+
+ old_matrix = qt2160->key_matrix;
+
+ ret = qt2160_read(client, QT2160_CMD_KEYS3);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "could not get keys from register 3\n");
+ goto err_unlock;
+ }
+
+ qt2160->key_matrix = ret;
+
+ ret = qt2160_read(client, QT2160_CMD_KEYS4);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "could not get keys from register 4\n");
+ goto err_unlock;
+ }
+
+ qt2160->key_matrix |= (ret << 8);
+
+ /* Read slide and GPIOs to clear CHANGE pin */
+ ret = qt2160_read(client, QT2160_CMD_SLIDE);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "could not get slide status\n");
+ goto err_unlock;
+ }
+
+ ret = qt2160_read(client, QT2160_CMD_GPIOS);
+ if (ret < 0) {
+ dev_err(&client->dev, "could not get GPIOs\n");
+ goto err_unlock;
+ }
+
+ for (i = 0; i < 16; ++i) {
+ int keyval = (qt2160->key_matrix >> i) & 0x01;
+
+ if (((old_matrix >> i) & 0x01) != keyval) {
+ input_report_key(qt2160->input,
+ ((unsigned char *)qt2160->input->keycode)[i],
+ keyval);
+ input_sync(qt2160->input);
+
+ if (keyval)
+ dev_dbg(&client->dev, "key %d pressed\n", i);
+ else
+ dev_dbg(&client->dev, "key %d released\n", i);
+ }
+ }
+
+ mutex_unlock(&qt2160->mlock);
+ return 0;
+
+err_unlock:
+ mutex_unlock(&qt2160->mlock);
+ return ret;
+}
+
+static irqreturn_t qt2160_irq(int irq, void *_qt2160)
+{
+ struct qt2160_data *qt2160 = _qt2160;
+
+ schedule_work(&qt2160->handle_irq_work);
+ return IRQ_HANDLED;
+}
+
+static void qt2160_worker(struct work_struct *work)
+{
+ struct qt2160_data *qt2160;
+
+ qt2160 = container_of(work, struct qt2160_data,
+ handle_irq_work);
+
+ dev_dbg(&qt2160->client->dev, "irq worker\n");
+ qt2160_get_key_matrix(qt2160->client);
+}
+
+static void qt2160_cycle_worker(struct work_struct *work)
+{
+ struct qt2160_data *qt2160;
+
+ qt2160 = container_of(work, struct qt2160_data,
+ handle_work.work);
+
+ dev_dbg(&qt2160->client->dev, "cycling worker\n");
+ qt2160_get_key_matrix(qt2160->client);
+
+ /* Avoid lock checking every 500ms */
+ schedule_delayed_work(&qt2160->handle_work, QT2160_CYCLE_INTERVAL);
+}
+
+static int __devinit qt2160_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret, i;
+ struct qt2160_data *qt2160;
+
+ dev_info(&client->dev, "probing device...\n");
+
+ /* Read Chid ID to check if chip is valid */
+ ret = qt2160_read(client, QT2160_CMD_CHIPID);
+ if (ret != QT2160_VALID_CHIPID) {
+ dev_err(&client->dev, "ID %d not supported\n", ret);
+ return ret;
+ }
+
+ /* Chip is valid and active. Allocate structure */
+ qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
+ if (!qt2160) {
+ dev_err(&client->dev, "insufficient memory\n");
+ return -ENOMEM;
+ }
+
+ i2c_set_clientdata(client, qt2160);
+ qt2160->client = client;
+
+ /* Read chip firmware version */
+ ret = qt2160_read(client, QT2160_CMD_CODEVER);
+ if (ret < 0) {
+ dev_err(&client->dev, "could not get firmware version\n");
+ goto err_free_qtdata;
+ }
+
+ qt2160->version_major = ret >> 4;
+ qt2160->version_minor = ret & 0xf;
+
+ /* Read chip firmware revision */
+ ret = qt2160_read(client, QT2160_CMD_SUBVER);
+ if (ret < 0) {
+ dev_err(&client->dev, "could not get firmware revision\n");
+ goto err_free_qtdata;
+ }
+
+ qt2160->version_rev = ret;
+
+ dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
+ qt2160->version_major, qt2160->version_minor,
+ qt2160->version_rev);
+
+ /* Calibrate device */
+ ret = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to calibrate device\n");
+ goto err_free_input;
+ }
+
+ /* Initialize input structure */
+ qt2160->input = input_allocate_device();
+ if (!qt2160->input) {
+ dev_err(&client->dev, "input device: Not enough memory\n");
+ ret = -ENOMEM;
+ goto err_free_qtdata;
+ }
+
+ qt2160->input->name = "AT42QT2160 Touch Sense Keyboard";
+ qt2160->input->id.bustype = BUS_I2C;
+ qt2160->input->keycode = qt2160_key2code;
+ qt2160->input->keycodesize = sizeof(unsigned char);
+ qt2160->input->keycodemax = ARRAY_SIZE(qt2160_key2code);
+
+ __set_bit(EV_KEY, qt2160->input->evbit);
+ __clear_bit(EV_REP, qt2160->input->evbit);
+ for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++)
+ __set_bit(qt2160_key2code[i], qt2160->input->keybit);
+
+ ret = input_register_device(qt2160->input);
+ if (ret) {
+ dev_err(&client->dev,
+ "input device: Failed to register device\n");
+ goto err_free_input;
+ }
+
+ /* Initialize IRQ structure */
+ mutex_init(&qt2160->mlock);
+
+ INIT_DELAYED_WORK(&qt2160->handle_work, qt2160_cycle_worker);
+ INIT_WORK(&qt2160->handle_irq_work, qt2160_worker);
+ schedule_delayed_work(&qt2160->handle_work, QT2160_CYCLE_INTERVAL);
+
+ if (client->irq) {
+ ret = request_irq(client->irq, qt2160_irq,
+ (IRQF_TRIGGER_FALLING), "qt2160", qt2160);
+
+ if (ret) {
+ dev_err(&client->dev,
+ "failed to allocate irq %d\n",
+ client->irq);
+ goto err_free_input;
+ }
+ }
+
+ dev_info(&client->dev, "AT42QT2160 reset completed\n");
+ return 0;
+
+err_free_input:
+ input_free_device(qt2160->input);
+
+err_free_qtdata:
+ kfree(qt2160);
+ i2c_set_clientdata(client, NULL);
+ return ret;
+}
+
+static int __devexit qt2160_remove(struct i2c_client *client)
+{
+ struct qt2160_data *qt2160;
+
+ qt2160 = i2c_get_clientdata(client);
+
+ /* Release IRQ so no queue will be scheduled */
+ free_irq(client->irq, qt2160);
+
+ /* Wait all pending works */
+ cancel_delayed_work_sync(&qt2160->handle_work);
+ cancel_work_sync(&qt2160->handle_irq_work);
+
+ /* Unregister input device */
+ input_unregister_device(qt2160->input);
+
+ /* Free client data */
+ kfree(qt2160);
+ i2c_set_clientdata(client, NULL);
+
+ dev_info(&client->dev, "AT42QT2160 removed.\n");
+ return 0;
+}
+
+static struct i2c_device_id qt2160_idtable[] = {
+ { "qt2160", 0, },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, qt2160_idtable);
+
+static struct i2c_driver qt2160_driver = {
+ .driver = {
+ .name = "qt2160",
+ .owner = THIS_MODULE,
+ },
+
+ .id_table = qt2160_idtable,
+ .probe = qt2160_probe,
+ .remove = qt2160_remove,
+};
+
+static int __init qt2160_init(void)
+{
+ int res;
+
+ res = i2c_add_driver(&qt2160_driver);
+ if (res) {
+ printk(KERN_ERR "qt2160: Driver registration failed, "
+ "module not inserted.\n");
+ return res;
+ }
+ return 0;
+}
+
+static void __exit qt2160_cleanup(void)
+{
+ i2c_del_driver(&qt2160_driver);
+}
+
+MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@xxxxxxxxx>");
+MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
+MODULE_LICENSE("GPL");
+
+module_init(qt2160_init);
+module_exit(qt2160_cleanup);
--
Raphael Derosso Pereira
Engenheiro de Computação
msn: rderossopereira@xxxxxxxxxxx
Skype: rderossopereira
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