// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for keys on TCA6416 I2C IO expander
*
* Copyright (C) 2010 Texas Instruments
*
* Author : Sriramakrishnan.A.G. <[email protected]>
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/tca6416_keypad.h>
#define TCA6416_INPUT 0
#define TCA6416_OUTPUT 1
#define TCA6416_INVERT 2
#define TCA6416_DIRECTION 3
#define TCA6416_POLL_INTERVAL 100 /* msec */
static const struct i2c_device_id tca6416_id[] = {
{ "tca6416-keys", 16, },
{ "tca6408-keys", 8, },
{ }
};
MODULE_DEVICE_TABLE(i2c, tca6416_id);
struct tca6416_keypad_chip {
uint16_t reg_output;
uint16_t reg_direction;
uint16_t reg_input;
struct i2c_client *client;
struct input_dev *input;
int io_size;
u16 pinmask;
bool use_polling;
struct tca6416_button buttons[];
};
static int tca6416_write_reg(struct tca6416_keypad_chip *chip, int reg, u16 val)
{
int error;
error = chip->io_size > 8 ?
i2c_smbus_write_word_data(chip->client, reg << 1, val) :
i2c_smbus_write_byte_data(chip->client, reg, val);
if (error < 0) {
dev_err(&chip->client->dev,
"%s failed, reg: %d, val: %d, error: %d\n",
__func__, reg, val, error);
return error;
}
return 0;
}
static int tca6416_read_reg(struct tca6416_keypad_chip *chip, int reg, u16 *val)
{
int retval;
retval = chip->io_size > 8 ?
i2c_smbus_read_word_data(chip->client, reg << 1) :
i2c_smbus_read_byte_data(chip->client, reg);
if (retval < 0) {
dev_err(&chip->client->dev, "%s failed, reg: %d, error: %d\n",
__func__, reg, retval);
return retval;
}
*val = (u16)retval;
return 0;
}
static void tca6416_keys_scan(struct input_dev *input)
{
struct tca6416_keypad_chip *chip = input_get_drvdata(input);
u16 reg_val, val;
int error, i, pin_index;
error = tca6416_read_reg(chip, TCA6416_INPUT, ®_val);
if (error)
return;
reg_val &= chip->pinmask;
/* Figure out which lines have changed */
val = reg_val ^ chip->reg_input;
chip->reg_input = reg_val;
for (i = 0, pin_index = 0; i < 16; i++) {
if (val & (1 << i)) {
struct tca6416_button *button = &chip->buttons[pin_index];
unsigned int type = button->type ?: EV_KEY;
int state = ((reg_val & (1 << i)) ? 1 : 0)
^ button->active_low;
input_event(input, type, button->code, !!state);
input_sync(input);
}
if (chip->pinmask & (1 << i))
pin_index++;
}
}
/*
* This is threaded IRQ handler and this can (and will) sleep.
*/
static irqreturn_t tca6416_keys_isr(int irq, void *dev_id)
{
tca6416_keys_scan(dev_id);
return IRQ_HANDLED;
}
static int tca6416_keys_open(struct input_dev *dev)
{
struct tca6416_keypad_chip *chip = input_get_drvdata(dev);
if (!chip->use_polling) {
/* Get initial device state in case it has switches */
tca6416_keys_scan(dev);
enable_irq(chip->client->irq);
}
return 0;
}
static void tca6416_keys_close(struct input_dev *dev)
{
struct tca6416_keypad_chip *chip = input_get_drvdata(dev);
if (!chip->use_polling)
disable_irq(chip->client->irq);
}
static int tca6416_setup_registers(struct tca6416_keypad_chip *chip)
{
int error;
error = tca6416_read_reg(chip, TCA6416_OUTPUT, &chip->reg_output);
if (error)
return error;
error = tca6416_read_reg(chip, TCA6416_DIRECTION, &chip->reg_direction);
if (error)
return error;
/* ensure that keypad pins are set to input */
error = tca6416_write_reg(chip, TCA6416_DIRECTION,
chip->reg_direction | chip->pinmask);
if (error)
return error;
error = tca6416_read_reg(chip, TCA6416_DIRECTION, &chip->reg_direction);
if (error)
return error;
error = tca6416_read_reg(chip, TCA6416_INPUT, &chip->reg_input);
if (error)
return error;
chip->reg_input &= chip->pinmask;
return 0;
}
static int tca6416_keypad_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct tca6416_keys_platform_data *pdata;
struct tca6416_keypad_chip *chip;
struct input_dev *input;
int error;
int i;
/* Check functionality */
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
dev_err(&client->dev, "%s adapter not supported\n",
dev_driver_string(&client->adapter->dev));
return -ENODEV;
}
pdata = dev_get_platdata(&client->dev);
if (!pdata) {
dev_dbg(&client->dev, "no platform data\n");
return -EINVAL;
}
chip = devm_kzalloc(&client->dev,
struct_size(chip, buttons, pdata->nbuttons),
GFP_KERNEL);
if (!chip)
return -ENOMEM;
input = devm_input_allocate_device(&client->dev);
if (!input)
return -ENOMEM;
chip->client = client;
chip->input = input;
chip->io_size = id->driver_data;
chip->pinmask = pdata->pinmask;
chip->use_polling = pdata->use_polling;
input->phys = "tca6416-keys/input0";
input->name = client->name;
input->open = tca6416_keys_open;
input->close = tca6416_keys_close;
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
/* Enable auto repeat feature of Linux input subsystem */
if (pdata->rep)
__set_bit(EV_REP, input->evbit);
for (i = 0; i < pdata->nbuttons; i++) {
unsigned int type;
chip->buttons[i] = pdata->buttons[i];
type = (pdata->buttons[i].type) ?: EV_KEY;
input_set_capability(input, type, pdata->buttons[i].code);
}
input_set_drvdata(input, chip);
/*
* Initialize cached registers from their original values.
* we can't share this chip with another i2c master.
*/
error = tca6416_setup_registers(chip);
if (error)
return error;
if (chip->use_polling) {
error = input_setup_polling(input, tca6416_keys_scan);
if (error) {
dev_err(&client->dev, "Failed to setup polling\n");
return error;
}
input_set_poll_interval(input, TCA6416_POLL_INTERVAL);
} else {
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, tca6416_keys_isr,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT |
IRQF_NO_AUTOEN,
"tca6416-keypad", input);
if (error) {
dev_dbg(&client->dev,
"Unable to claim irq %d; error %d\n",
client->irq, error);
return error;
}
}
error = input_register_device(input);
if (error) {
dev_dbg(&client->dev,
"Unable to register input device, error: %d\n", error);
return error;
}
i2c_set_clientdata(client, chip);
return 0;
}
static struct i2c_driver tca6416_keypad_driver = {
.driver = {
.name = "tca6416-keypad",
},
.probe = tca6416_keypad_probe,
.id_table = tca6416_id,
};
static int __init tca6416_keypad_init(void)
{
return i2c_add_driver(&tca6416_keypad_driver);
}
subsys_initcall(tca6416_keypad_init);
static void __exit tca6416_keypad_exit(void)
{
i2c_del_driver(&tca6416_keypad_driver);
}
module_exit(tca6416_keypad_exit);
MODULE_AUTHOR("Sriramakrishnan <[email protected]>");
MODULE_DESCRIPTION("Keypad driver over tca6416 IO expander");
MODULE_LICENSE("GPL");
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