472 lines
10 KiB
C
472 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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#include <linux/kernel.h>
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#include <linux/leds.h>
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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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#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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#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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#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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char name[32];
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int id;
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enum led_brightness brightness;
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};
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#endif
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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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unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
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u16 key_matrix;
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#ifdef CONFIG_LEDS_CLASS
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struct qt2160_led leds[QT2160_NUM_LEDS_X];
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#endif
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};
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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 int 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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struct qt2160_data *qt2160 = led->qt2160;
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struct i2c_client *client = qt2160->client;
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u32 drive, pwmen;
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if (value != led->brightness) {
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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 |= BIT(led->id);
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pwmen |= BIT(led->id);
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} else {
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drive &= ~BIT(led->id);
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pwmen &= ~BIT(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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led->brightness = value;
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}
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return 0;
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}
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#endif /* CONFIG_LEDS_CLASS */
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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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mod_delayed_work(system_wq, &qt2160->dwork, 0);
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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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schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
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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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static int qt2160_read(struct i2c_client *client, u8 reg)
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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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static int qt2160_write(struct i2c_client *client, u8 reg, u8 data)
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{
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int ret;
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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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"couldn't write data. Returned %d\n", ret);
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return ret;
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}
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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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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_blocking = 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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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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}
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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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static bool qt2160_identify(struct i2c_client *client)
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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);
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return false;
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}
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/* Read chip firmware version */
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ver = qt2160_read(client, QT2160_CMD_CODEVER);
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if (ver < 0) {
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dev_err(&client->dev, "could not get firmware version\n");
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return false;
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}
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/* Read chip firmware revision */
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rev = qt2160_read(client, QT2160_CMD_SUBVER);
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if (rev < 0) {
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dev_err(&client->dev, "could not get firmware revision\n");
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return false;
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}
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dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
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ver >> 4, ver & 0xf, rev);
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return true;
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}
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static int qt2160_probe(struct i2c_client *client)
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{
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struct qt2160_data *qt2160;
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struct input_dev *input;
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int i;
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int error;
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/* Check functionality */
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error = i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE);
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if (!error) {
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dev_err(&client->dev, "%s adapter not supported\n",
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dev_driver_string(&client->adapter->dev));
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return -ENODEV;
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}
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if (!qt2160_identify(client))
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return -ENODEV;
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/* Chip is valid and active. Allocate structure */
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qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
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input = input_allocate_device();
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if (!qt2160 || !input) {
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dev_err(&client->dev, "insufficient memory\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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qt2160->client = client;
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qt2160->input = input;
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INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);
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input->name = "AT42QT2160 Touch Sense Keyboard";
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input->id.bustype = BUS_I2C;
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input->keycode = qt2160->keycodes;
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input->keycodesize = sizeof(qt2160->keycodes[0]);
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input->keycodemax = ARRAY_SIZE(qt2160_key2code);
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__set_bit(EV_KEY, input->evbit);
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__clear_bit(EV_REP, input->evbit);
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for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) {
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qt2160->keycodes[i] = qt2160_key2code[i];
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__set_bit(qt2160_key2code[i], input->keybit);
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}
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__clear_bit(KEY_RESERVED, input->keybit);
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/* Calibrate device */
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error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
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if (error) {
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dev_err(&client->dev, "failed to calibrate device\n");
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goto err_free_mem;
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}
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if (client->irq) {
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error = request_irq(client->irq, qt2160_irq,
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IRQF_TRIGGER_FALLING, "qt2160", qt2160);
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if (error) {
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dev_err(&client->dev,
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"failed to allocate irq %d\n", client->irq);
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goto err_free_mem;
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}
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}
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error = qt2160_register_leds(qt2160);
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if (error) {
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dev_err(&client->dev, "Failed to register leds\n");
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goto err_free_irq;
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}
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error = input_register_device(qt2160->input);
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if (error) {
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dev_err(&client->dev,
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"Failed to register input device\n");
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goto err_unregister_leds;
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}
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i2c_set_clientdata(client, qt2160);
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qt2160_schedule_read(qt2160);
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return 0;
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err_unregister_leds:
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qt2160_unregister_leds(qt2160);
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err_free_irq:
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if (client->irq)
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free_irq(client->irq, qt2160);
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err_free_mem:
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input_free_device(input);
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kfree(qt2160);
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return error;
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}
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static void qt2160_remove(struct i2c_client *client)
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{
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struct qt2160_data *qt2160 = i2c_get_clientdata(client);
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qt2160_unregister_leds(qt2160);
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/* Release IRQ so no queue will be scheduled */
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if (client->irq)
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free_irq(client->irq, qt2160);
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cancel_delayed_work_sync(&qt2160->dwork);
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input_unregister_device(qt2160->input);
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kfree(qt2160);
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}
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static const struct i2c_device_id qt2160_idtable[] = {
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{ "qt2160", 0, },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, qt2160_idtable);
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static struct i2c_driver qt2160_driver = {
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.driver = {
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.name = "qt2160",
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},
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.id_table = qt2160_idtable,
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.probe_new = qt2160_probe,
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.remove = qt2160_remove,
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};
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module_i2c_driver(qt2160_driver);
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MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@gmail.com>");
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MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
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MODULE_LICENSE("GPL");
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