2009-09-21 23:24:06 -06:00
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/*
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* qt2160.c - Atmel AT42QT2160 Touch Sense Controller
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*
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* Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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2013-01-04 17:36:46 -07:00
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#include <linux/leds.h>
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2009-09-21 23:24:06 -06:00
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#define QT2160_VALID_CHIPID 0x11
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#define QT2160_CMD_CHIPID 0
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#define QT2160_CMD_CODEVER 1
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#define QT2160_CMD_GSTAT 2
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#define QT2160_CMD_KEYS3 3
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#define QT2160_CMD_KEYS4 4
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#define QT2160_CMD_SLIDE 5
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#define QT2160_CMD_GPIOS 6
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#define QT2160_CMD_SUBVER 7
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#define QT2160_CMD_CALIBRATE 10
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2013-01-04 17:36:46 -07:00
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#define QT2160_CMD_DRIVE_X 70
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#define QT2160_CMD_PWMEN_X 74
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#define QT2160_CMD_PWM_DUTY 76
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#define QT2160_NUM_LEDS_X 8
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2009-09-21 23:24:06 -06:00
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#define QT2160_CYCLE_INTERVAL (2*HZ)
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static unsigned char qt2160_key2code[] = {
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KEY_0, KEY_1, KEY_2, KEY_3,
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KEY_4, KEY_5, KEY_6, KEY_7,
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KEY_8, KEY_9, KEY_A, KEY_B,
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KEY_C, KEY_D, KEY_E, KEY_F,
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};
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2013-01-04 17:36:46 -07:00
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#ifdef CONFIG_LEDS_CLASS
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struct qt2160_led {
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struct qt2160_data *qt2160;
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struct led_classdev cdev;
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struct work_struct work;
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char name[32];
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int id;
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enum led_brightness new_brightness;
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};
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#endif
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2009-09-21 23:24:06 -06:00
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struct qt2160_data {
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struct i2c_client *client;
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struct input_dev *input;
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struct delayed_work dwork;
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spinlock_t lock; /* Protects canceling/rescheduling of dwork */
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unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
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u16 key_matrix;
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2013-01-04 17:36:46 -07:00
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#ifdef CONFIG_LEDS_CLASS
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struct qt2160_led leds[QT2160_NUM_LEDS_X];
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struct mutex led_lock;
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#endif
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2009-09-21 23:24:06 -06:00
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};
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2013-01-04 17:36:46 -07:00
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static int qt2160_read(struct i2c_client *client, u8 reg);
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static int qt2160_write(struct i2c_client *client, u8 reg, u8 data);
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#ifdef CONFIG_LEDS_CLASS
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static void qt2160_led_work(struct work_struct *work)
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{
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struct qt2160_led *led = container_of(work, struct qt2160_led, work);
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struct qt2160_data *qt2160 = led->qt2160;
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struct i2c_client *client = qt2160->client;
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int value = led->new_brightness;
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u32 drive, pwmen;
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mutex_lock(&qt2160->led_lock);
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drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
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pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
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if (value != LED_OFF) {
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drive |= (1 << led->id);
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pwmen |= (1 << led->id);
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} else {
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drive &= ~(1 << led->id);
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pwmen &= ~(1 << led->id);
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}
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qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
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qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);
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/*
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* Changing this register will change the brightness
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* of every LED in the qt2160. It's a HW limitation.
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*/
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if (value != LED_OFF)
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qt2160_write(client, QT2160_CMD_PWM_DUTY, value);
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mutex_unlock(&qt2160->led_lock);
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}
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static void qt2160_led_set(struct led_classdev *cdev,
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enum led_brightness value)
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{
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struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev);
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led->new_brightness = value;
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schedule_work(&led->work);
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}
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#endif /* CONFIG_LEDS_CLASS */
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2009-09-21 23:24:06 -06:00
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static int qt2160_read_block(struct i2c_client *client,
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u8 inireg, u8 *buffer, unsigned int count)
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{
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int error, idx = 0;
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/*
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* Can't use SMBus block data read. Check for I2C functionality to speed
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* things up whenever possible. Otherwise we will be forced to read
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* sequentially.
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*/
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if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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error = i2c_smbus_write_byte(client, inireg + idx);
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if (error) {
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dev_err(&client->dev,
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"couldn't send request. Returned %d\n", error);
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return error;
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}
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error = i2c_master_recv(client, buffer, count);
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if (error != count) {
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dev_err(&client->dev,
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"couldn't read registers. Returned %d bytes\n", error);
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return error;
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}
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} else {
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while (count--) {
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int data;
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error = i2c_smbus_write_byte(client, inireg + idx);
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if (error) {
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dev_err(&client->dev,
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"couldn't send request. Returned %d\n", error);
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return error;
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}
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data = i2c_smbus_read_byte(client);
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if (data < 0) {
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dev_err(&client->dev,
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"couldn't read register. Returned %d\n", data);
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return data;
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}
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buffer[idx++] = data;
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}
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}
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return 0;
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}
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static int qt2160_get_key_matrix(struct qt2160_data *qt2160)
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{
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struct i2c_client *client = qt2160->client;
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struct input_dev *input = qt2160->input;
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u8 regs[6];
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u16 old_matrix, new_matrix;
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int ret, i, mask;
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dev_dbg(&client->dev, "requesting keys...\n");
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/*
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* Read all registers from General Status Register
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* to GPIOs register
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*/
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ret = qt2160_read_block(client, QT2160_CMD_GSTAT, regs, 6);
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if (ret) {
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dev_err(&client->dev,
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"could not perform chip read.\n");
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return ret;
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}
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old_matrix = qt2160->key_matrix;
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qt2160->key_matrix = new_matrix = (regs[2] << 8) | regs[1];
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mask = 0x01;
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for (i = 0; i < 16; ++i, mask <<= 1) {
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int keyval = new_matrix & mask;
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if ((old_matrix & mask) != keyval) {
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input_report_key(input, qt2160->keycodes[i], keyval);
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dev_dbg(&client->dev, "key %d %s\n",
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i, keyval ? "pressed" : "released");
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}
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}
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input_sync(input);
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return 0;
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}
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static irqreturn_t qt2160_irq(int irq, void *_qt2160)
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{
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struct qt2160_data *qt2160 = _qt2160;
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unsigned long flags;
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spin_lock_irqsave(&qt2160->lock, flags);
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2012-08-21 14:18:24 -06:00
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mod_delayed_work(system_wq, &qt2160->dwork, 0);
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2009-09-21 23:24:06 -06:00
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spin_unlock_irqrestore(&qt2160->lock, flags);
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return IRQ_HANDLED;
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}
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static void qt2160_schedule_read(struct qt2160_data *qt2160)
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{
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spin_lock_irq(&qt2160->lock);
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schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
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spin_unlock_irq(&qt2160->lock);
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}
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static void qt2160_worker(struct work_struct *work)
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{
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struct qt2160_data *qt2160 =
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container_of(work, struct qt2160_data, dwork.work);
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dev_dbg(&qt2160->client->dev, "worker\n");
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qt2160_get_key_matrix(qt2160);
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/* Avoid device lock up by checking every so often */
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qt2160_schedule_read(qt2160);
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}
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2012-11-23 22:38:25 -07:00
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static int qt2160_read(struct i2c_client *client, u8 reg)
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2009-09-21 23:24:06 -06:00
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{
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int ret;
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ret = i2c_smbus_write_byte(client, reg);
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if (ret) {
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dev_err(&client->dev,
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"couldn't send request. Returned %d\n", ret);
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return ret;
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}
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ret = i2c_smbus_read_byte(client);
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if (ret < 0) {
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dev_err(&client->dev,
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"couldn't read register. Returned %d\n", ret);
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return ret;
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}
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return ret;
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}
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2012-11-23 22:38:25 -07:00
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static int qt2160_write(struct i2c_client *client, u8 reg, u8 data)
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2009-09-21 23:24:06 -06:00
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{
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2012-10-25 00:55:01 -06:00
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int ret;
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2009-09-21 23:24:06 -06:00
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2012-10-25 00:55:01 -06:00
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ret = i2c_smbus_write_byte_data(client, reg, data);
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if (ret < 0)
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dev_err(&client->dev,
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2012-10-25 00:55:01 -06:00
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"couldn't write data. Returned %d\n", ret);
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2009-09-21 23:24:06 -06:00
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2012-10-25 00:55:01 -06:00
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return ret;
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2009-09-21 23:24:06 -06:00
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}
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2013-01-04 17:36:46 -07:00
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#ifdef CONFIG_LEDS_CLASS
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static int qt2160_register_leds(struct qt2160_data *qt2160)
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{
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struct i2c_client *client = qt2160->client;
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int ret;
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int i;
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mutex_init(&qt2160->led_lock);
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for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
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struct qt2160_led *led = &qt2160->leds[i];
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snprintf(led->name, sizeof(led->name), "qt2160:x%d", i);
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led->cdev.name = led->name;
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led->cdev.brightness_set = qt2160_led_set;
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led->cdev.brightness = LED_OFF;
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led->id = i;
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led->qt2160 = qt2160;
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INIT_WORK(&led->work, qt2160_led_work);
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ret = led_classdev_register(&client->dev, &led->cdev);
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if (ret < 0)
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return ret;
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}
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/* Tur off LEDs */
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qt2160_write(client, QT2160_CMD_DRIVE_X, 0);
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qt2160_write(client, QT2160_CMD_PWMEN_X, 0);
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qt2160_write(client, QT2160_CMD_PWM_DUTY, 0);
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return 0;
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}
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static void qt2160_unregister_leds(struct qt2160_data *qt2160)
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{
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int i;
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for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
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led_classdev_unregister(&qt2160->leds[i].cdev);
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cancel_work_sync(&qt2160->leds[i].work);
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}
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}
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#else
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static inline int qt2160_register_leds(struct qt2160_data *qt2160)
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{
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return 0;
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}
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static inline void qt2160_unregister_leds(struct qt2160_data *qt2160)
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{
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}
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#endif
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2009-09-21 23:24:06 -06:00
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2012-11-23 22:38:25 -07:00
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static bool qt2160_identify(struct i2c_client *client)
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2009-09-21 23:24:06 -06:00
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{
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int id, ver, rev;
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/* Read Chid ID to check if chip is valid */
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id = qt2160_read(client, QT2160_CMD_CHIPID);
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if (id != QT2160_VALID_CHIPID) {
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dev_err(&client->dev, "ID %d not supported\n", id);
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read chip firmware version */
|
|
|
|
ver = qt2160_read(client, QT2160_CMD_CODEVER);
|
|
|
|
if (ver < 0) {
|
|
|
|
dev_err(&client->dev, "could not get firmware version\n");
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read chip firmware revision */
|
|
|
|
rev = qt2160_read(client, QT2160_CMD_SUBVER);
|
|
|
|
if (rev < 0) {
|
|
|
|
dev_err(&client->dev, "could not get firmware revision\n");
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
|
|
|
|
ver >> 4, ver & 0xf, rev);
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2012-11-23 22:38:25 -07:00
|
|
|
static int qt2160_probe(struct i2c_client *client,
|
2013-01-04 17:36:46 -07:00
|
|
|
const struct i2c_device_id *id)
|
2009-09-21 23:24:06 -06:00
|
|
|
{
|
|
|
|
struct qt2160_data *qt2160;
|
|
|
|
struct input_dev *input;
|
|
|
|
int i;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
/* Check functionality */
|
|
|
|
error = i2c_check_functionality(client->adapter,
|
|
|
|
I2C_FUNC_SMBUS_BYTE);
|
|
|
|
if (!error) {
|
|
|
|
dev_err(&client->dev, "%s adapter not supported\n",
|
|
|
|
dev_driver_string(&client->adapter->dev));
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!qt2160_identify(client))
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
/* Chip is valid and active. Allocate structure */
|
|
|
|
qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
|
|
|
|
input = input_allocate_device();
|
|
|
|
if (!qt2160 || !input) {
|
|
|
|
dev_err(&client->dev, "insufficient memory\n");
|
|
|
|
error = -ENOMEM;
|
|
|
|
goto err_free_mem;
|
|
|
|
}
|
|
|
|
|
|
|
|
qt2160->client = client;
|
|
|
|
qt2160->input = input;
|
|
|
|
INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);
|
|
|
|
spin_lock_init(&qt2160->lock);
|
|
|
|
|
|
|
|
input->name = "AT42QT2160 Touch Sense Keyboard";
|
|
|
|
input->id.bustype = BUS_I2C;
|
|
|
|
|
|
|
|
input->keycode = qt2160->keycodes;
|
|
|
|
input->keycodesize = sizeof(qt2160->keycodes[0]);
|
|
|
|
input->keycodemax = ARRAY_SIZE(qt2160_key2code);
|
|
|
|
|
|
|
|
__set_bit(EV_KEY, input->evbit);
|
|
|
|
__clear_bit(EV_REP, input->evbit);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) {
|
|
|
|
qt2160->keycodes[i] = qt2160_key2code[i];
|
|
|
|
__set_bit(qt2160_key2code[i], input->keybit);
|
|
|
|
}
|
|
|
|
__clear_bit(KEY_RESERVED, input->keybit);
|
|
|
|
|
|
|
|
/* Calibrate device */
|
|
|
|
error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
|
|
|
|
if (error) {
|
|
|
|
dev_err(&client->dev, "failed to calibrate device\n");
|
|
|
|
goto err_free_mem;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (client->irq) {
|
|
|
|
error = request_irq(client->irq, qt2160_irq,
|
|
|
|
IRQF_TRIGGER_FALLING, "qt2160", qt2160);
|
|
|
|
if (error) {
|
|
|
|
dev_err(&client->dev,
|
|
|
|
"failed to allocate irq %d\n", client->irq);
|
|
|
|
goto err_free_mem;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-01-04 17:36:46 -07:00
|
|
|
error = qt2160_register_leds(qt2160);
|
|
|
|
if (error) {
|
|
|
|
dev_err(&client->dev, "Failed to register leds\n");
|
|
|
|
goto err_free_irq;
|
|
|
|
}
|
|
|
|
|
2009-09-21 23:24:06 -06:00
|
|
|
error = input_register_device(qt2160->input);
|
|
|
|
if (error) {
|
|
|
|
dev_err(&client->dev,
|
|
|
|
"Failed to register input device\n");
|
2013-01-04 17:36:46 -07:00
|
|
|
goto err_unregister_leds;
|
2009-09-21 23:24:06 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
i2c_set_clientdata(client, qt2160);
|
|
|
|
qt2160_schedule_read(qt2160);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2013-01-04 17:36:46 -07:00
|
|
|
err_unregister_leds:
|
|
|
|
qt2160_unregister_leds(qt2160);
|
2009-09-21 23:24:06 -06:00
|
|
|
err_free_irq:
|
|
|
|
if (client->irq)
|
|
|
|
free_irq(client->irq, qt2160);
|
|
|
|
err_free_mem:
|
|
|
|
input_free_device(input);
|
|
|
|
kfree(qt2160);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2012-11-23 22:50:47 -07:00
|
|
|
static int qt2160_remove(struct i2c_client *client)
|
2009-09-21 23:24:06 -06:00
|
|
|
{
|
|
|
|
struct qt2160_data *qt2160 = i2c_get_clientdata(client);
|
|
|
|
|
2013-01-04 17:36:46 -07:00
|
|
|
qt2160_unregister_leds(qt2160);
|
|
|
|
|
2009-09-21 23:24:06 -06:00
|
|
|
/* Release IRQ so no queue will be scheduled */
|
|
|
|
if (client->irq)
|
|
|
|
free_irq(client->irq, qt2160);
|
|
|
|
|
|
|
|
cancel_delayed_work_sync(&qt2160->dwork);
|
|
|
|
|
|
|
|
input_unregister_device(qt2160->input);
|
|
|
|
kfree(qt2160);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-01-10 00:23:02 -07:00
|
|
|
static const struct i2c_device_id qt2160_idtable[] = {
|
2009-09-21 23:24:06 -06:00
|
|
|
{ "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,
|
2012-11-23 22:27:39 -07:00
|
|
|
.remove = qt2160_remove,
|
2009-09-21 23:24:06 -06:00
|
|
|
};
|
|
|
|
|
2012-03-17 00:05:41 -06:00
|
|
|
module_i2c_driver(qt2160_driver);
|
2009-09-21 23:24:06 -06:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@gmail.com>");
|
|
|
|
MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
|
|
|
|
MODULE_LICENSE("GPL");
|