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Release 4.11 drivers/input/keyboard/tca6416-keypad.c

/*
 * Driver for keys on TCA6416 I2C IO expander
 *
 * Copyright (C) 2010 Texas Instruments
 *
 * Author : Sriramakrishnan.A.G. <srk@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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/gpio.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


static const struct i2c_device_id tca6416_id[] = {
	{ "tca6416-keys", 16, },
	{ "tca6408-keys", 8, },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tca6416_id);


struct tca6416_drv_data {
	
struct input_dev *input;
	
struct tca6416_button data[0];
};


struct tca6416_keypad_chip {
	
uint16_t reg_output;
	
uint16_t reg_direction;
	
uint16_t reg_input;

	
struct i2c_client *client;
	
struct input_dev *input;
	
struct delayed_work dwork;
	
int io_size;
	
int irqnum;
	
u16 pinmask;
	
bool use_polling;
	
struct tca6416_button buttons[0];
};


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; }

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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; }

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static void tca6416_keys_scan(struct tca6416_keypad_chip *chip) { struct input_dev *input = chip->input; u16 reg_val, val; int error, i, pin_index; error = tca6416_read_reg(chip, TCA6416_INPUT, &reg_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++; } }

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/* * This is threaded IRQ handler and this can (and will) sleep. */
static irqreturn_t tca6416_keys_isr(int irq, void *dev_id) { struct tca6416_keypad_chip *chip = dev_id; tca6416_keys_scan(chip); return IRQ_HANDLED; }

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static void tca6416_keys_work_func(struct work_struct *work) { struct tca6416_keypad_chip *chip = container_of(work, struct tca6416_keypad_chip, dwork.work); tca6416_keys_scan(chip); schedule_delayed_work(&chip->dwork, msecs_to_jiffies(100)); }

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static int tca6416_keys_open(struct input_dev *dev) { struct tca6416_keypad_chip *chip = input_get_drvdata(dev); /* Get initial device state in case it has switches */ tca6416_keys_scan(chip); if (chip->use_polling) schedule_delayed_work(&chip->dwork, msecs_to_jiffies(100)); else enable_irq(chip->irqnum); return 0; }

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static void tca6416_keys_close(struct input_dev *dev) { struct tca6416_keypad_chip *chip = input_get_drvdata(dev); if (chip->use_polling) cancel_delayed_work_sync(&chip->dwork); else disable_irq(chip->irqnum); }

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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; }

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static int tca6416_keypad_probe(struct i2c_client *client, const struct i2c_device_id *id) { 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 = kzalloc(sizeof(struct tca6416_keypad_chip) + pdata->nbuttons * sizeof(struct tca6416_button), GFP_KERNEL); input = input_allocate_device(); if (!chip || !input) { error = -ENOMEM; goto fail1; } chip->client = client; chip->input = input; chip->io_size = id->driver_data; chip->pinmask = pdata->pinmask; chip->use_polling = pdata->use_polling; INIT_DELAYED_WORK(&chip->dwork, tca6416_keys_work_func); input->phys = "tca6416-keys/input0"; input->name = client->name; input->dev.parent = &client->dev; 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) goto fail1; if (!chip->use_polling) { if (pdata->irq_is_gpio) chip->irqnum = gpio_to_irq(client->irq); else chip->irqnum = client->irq; error = request_threaded_irq(chip->irqnum, NULL, tca6416_keys_isr, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "tca6416-keypad", chip); if (error) { dev_dbg(&client->dev, "Unable to claim irq %d; error %d\n", chip->irqnum, error); goto fail1; } disable_irq(chip->irqnum); } error = input_register_device(input); if (error) { dev_dbg(&client->dev, "Unable to register input device, error: %d\n", error); goto fail2; } i2c_set_clientdata(client, chip); device_init_wakeup(&client->dev, 1); return 0; fail2: if (!chip->use_polling) { free_irq(chip->irqnum, chip); enable_irq(chip->irqnum); } fail1: input_free_device(input); kfree(chip); return error; }

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Lars-Peter Clausen20.36%120.00%
Total552100.00%5100.00%


static int tca6416_keypad_remove(struct i2c_client *client) { struct tca6416_keypad_chip *chip = i2c_get_clientdata(client); if (!chip->use_polling) { free_irq(chip->irqnum, chip); enable_irq(chip->irqnum); } input_unregister_device(chip->input); kfree(chip); return 0; }

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#ifdef CONFIG_PM_SLEEP
static int tca6416_keypad_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct tca6416_keypad_chip *chip = i2c_get_clientdata(client); if (device_may_wakeup(dev)) enable_irq_wake(chip->irqnum); return 0; }

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static int tca6416_keypad_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct tca6416_keypad_chip *chip = i2c_get_clientdata(client); if (device_may_wakeup(dev)) disable_irq_wake(chip->irqnum); return 0; }

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#endif static SIMPLE_DEV_PM_OPS(tca6416_keypad_dev_pm_ops, tca6416_keypad_suspend, tca6416_keypad_resume); static struct i2c_driver tca6416_keypad_driver = { .driver = { .name = "tca6416-keypad", .pm = &tca6416_keypad_dev_pm_ops, }, .probe = tca6416_keypad_probe, .remove = tca6416_keypad_remove, .id_table = tca6416_id, };
static int __init tca6416_keypad_init(void) { return i2c_add_driver(&tca6416_keypad_driver); }

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subsys_initcall(tca6416_keypad_init);
static void __exit tca6416_keypad_exit(void) { i2c_del_driver(&tca6416_keypad_driver); }

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module_exit(tca6416_keypad_exit); MODULE_AUTHOR("Sriramakrishnan <srk@ti.com>"); MODULE_DESCRIPTION("Keypad driver over tca6146 IO expander"); MODULE_LICENSE("GPL");

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Tony SIM513.13%120.00%
Jingoo Han40.25%120.00%
Lars-Peter Clausen20.12%120.00%
Total1629100.00%5100.00%
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