/* * Driver for TCA8418 I2C keyboard * * Copyright (C) 2011 Fuel7, Inc. All rights reserved. * * Author: Kyle Manna <[email protected]> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. * * If you can't comply with GPLv2, alternative licensing terms may be * arranged. Please contact Fuel7, Inc. (http://fuel7.com/) for proprietary * alternative licensing inquiries. */ #include <linux/delay.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/input.h> #include <linux/input/matrix_keypad.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/of.h> #include <linux/property.h> #include <linux/slab.h> #include <linux/types.h> /* TCA8418 hardware limits */ #define TCA8418_MAX_ROWS … #define TCA8418_MAX_COLS … /* TCA8418 register offsets */ #define REG_CFG … #define REG_INT_STAT … #define REG_KEY_LCK_EC … #define REG_KEY_EVENT_A … #define REG_KEY_EVENT_B … #define REG_KEY_EVENT_C … #define REG_KEY_EVENT_D … #define REG_KEY_EVENT_E … #define REG_KEY_EVENT_F … #define REG_KEY_EVENT_G … #define REG_KEY_EVENT_H … #define REG_KEY_EVENT_I … #define REG_KEY_EVENT_J … #define REG_KP_LCK_TIMER … #define REG_UNLOCK1 … #define REG_UNLOCK2 … #define REG_GPIO_INT_STAT1 … #define REG_GPIO_INT_STAT2 … #define REG_GPIO_INT_STAT3 … #define REG_GPIO_DAT_STAT1 … #define REG_GPIO_DAT_STAT2 … #define REG_GPIO_DAT_STAT3 … #define REG_GPIO_DAT_OUT1 … #define REG_GPIO_DAT_OUT2 … #define REG_GPIO_DAT_OUT3 … #define REG_GPIO_INT_EN1 … #define REG_GPIO_INT_EN2 … #define REG_GPIO_INT_EN3 … #define REG_KP_GPIO1 … #define REG_KP_GPIO2 … #define REG_KP_GPIO3 … #define REG_GPI_EM1 … #define REG_GPI_EM2 … #define REG_GPI_EM3 … #define REG_GPIO_DIR1 … #define REG_GPIO_DIR2 … #define REG_GPIO_DIR3 … #define REG_GPIO_INT_LVL1 … #define REG_GPIO_INT_LVL2 … #define REG_GPIO_INT_LVL3 … #define REG_DEBOUNCE_DIS1 … #define REG_DEBOUNCE_DIS2 … #define REG_DEBOUNCE_DIS3 … #define REG_GPIO_PULL1 … #define REG_GPIO_PULL2 … #define REG_GPIO_PULL3 … /* TCA8418 bit definitions */ #define CFG_AI … #define CFG_GPI_E_CFG … #define CFG_OVR_FLOW_M … #define CFG_INT_CFG … #define CFG_OVR_FLOW_IEN … #define CFG_K_LCK_IEN … #define CFG_GPI_IEN … #define CFG_KE_IEN … #define INT_STAT_CAD_INT … #define INT_STAT_OVR_FLOW_INT … #define INT_STAT_K_LCK_INT … #define INT_STAT_GPI_INT … #define INT_STAT_K_INT … /* TCA8418 register masks */ #define KEY_LCK_EC_KEC … #define KEY_EVENT_CODE … #define KEY_EVENT_VALUE … struct tca8418_keypad { … }; /* * Write a byte to the TCA8418 */ static int tca8418_write_byte(struct tca8418_keypad *keypad_data, int reg, u8 val) { … } /* * Read a byte from the TCA8418 */ static int tca8418_read_byte(struct tca8418_keypad *keypad_data, int reg, u8 *val) { … } static void tca8418_read_keypad(struct tca8418_keypad *keypad_data) { … } /* * Threaded IRQ handler and this can (and will) sleep. */ static irqreturn_t tca8418_irq_handler(int irq, void *dev_id) { … } /* * Configure the TCA8418 for keypad operation */ static int tca8418_configure(struct tca8418_keypad *keypad_data, u32 rows, u32 cols) { … } static int tca8418_keypad_probe(struct i2c_client *client) { … } static const struct i2c_device_id tca8418_id[] = …; MODULE_DEVICE_TABLE(i2c, tca8418_id); static const struct of_device_id tca8418_dt_ids[] = …; MODULE_DEVICE_TABLE(of, tca8418_dt_ids); static struct i2c_driver tca8418_keypad_driver = …; static int __init tca8418_keypad_init(void) { … } subsys_initcall(tca8418_keypad_init); static void __exit tca8418_keypad_exit(void) { … } module_exit(tca8418_keypad_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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