Input: add keypad driver for keys interfaced to TCA6416 (30ba3ead) · Commits · 戴 / test

drivers/input/keyboard/Kconfig

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		@@ -179,6 +179,22 @@ config KEYBOARD_GPIO
		To compile this driver as a module, choose M here: the
		module will be called gpio_keys.

		config KEYBOARD_TCA6416
		tristate "TCA6416 Keypad Support"
		depends on I2C
		help
		This driver implements basic keypad functionality
		for keys connected through TCA6416 IO expander

		Say Y here if your device has keys connected to
		TCA6416 IO expander. Your board-specific setup logic
		must also provide pin-mask details(of which TCA6416 pins
		are used for keypad).

		If enabled the complete TCA6416 device will be managed through
		this driver.


		config KEYBOARD_MATRIX
		tristate "GPIO driven matrix keypad support"
		depends on GENERIC_GPIO

drivers/input/keyboard/Makefile

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		@@ -14,6 +14,7 @@ obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
		obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
		obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
		obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
		obj-$(CONFIG_KEYBOARD_TCA6416) += tca6416-keypad.o
		obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
		obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
		obj-$(CONFIG_KEYBOARD_IMX) += imx_keypad.o

drivers/input/keyboard/tca6416-keypad.c

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		/*
		* 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, },
		{ }
		};
		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;
		u16 pinmask;
		int irqnum;
		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 = i2c_smbus_write_word_data(chip->client, reg << 1, 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 = i2c_smbus_read_word_data(chip->client, reg << 1);
		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 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++;
		}
		}

		/*
		* 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;
		}

		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));
		}

		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;
		}

		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);
		}

		static int __devinit 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 __devinit 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 = client->dev.platform_data;
		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->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,
		"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);

		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;
		}

		static int __devexit 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);

		i2c_set_clientdata(client, NULL);

		return 0;
		}


		static struct i2c_driver tca6416_keypad_driver = {
		.driver = {
		.name = "tca6416-keypad",
		},
		.probe = tca6416_keypad_probe,
		.remove = __devexit_p(tca6416_keypad_remove),
		.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 tca6146 IO expander");
		MODULE_LICENSE("GPL");

include/linux/tca6416_keypad.h

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		/*
		* tca6416 keypad platform support
		*
		* Copyright (C) 2010 Texas Instruments
		*
		* Author: Sriramakrishnan <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.
		*/

		#ifndef _TCA6416_KEYS_H
		#define _TCA6416_KEYS_H

		#include <linux/types.h>

		struct tca6416_button {
		/* Configuration parameters */
		int code; /* input event code (KEY_, SW_) */
		int active_low;
		int type; /* input event type (EV_KEY, EV_SW) */
		};

		struct tca6416_keys_platform_data {
		struct tca6416_button *buttons;
		int nbuttons;
		unsigned int rep:1; /* enable input subsystem auto repeat */
		uint16_t pinmask;
		uint16_t invert;
		int irq_is_gpio;
		int use_polling; /* use polling if Interrupt is not connected*/
		};
		#endif

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