+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Driver for keys on TCA6416 I2C IO expander
- *
- * Copyright (C) 2010 Texas Instruments
- *
- * Author : Sriramakrishnan.A.G. <srk@ti.com>
- */
-
-#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 <srk@ti.com>");
-MODULE_DESCRIPTION("Keypad driver over tca6416 IO expander");
-MODULE_LICENSE("GPL");
projects / thirdparty / kernel / linux.git / commitdiff
