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Release 4.11 drivers/input/keyboard/tca8418_keypad.c

/*
 * Driver for TCA8418 I2C keyboard
 *
 * Copyright (C) 2011 Fuel7, Inc.  All rights reserved.
 *
 * Author: Kyle Manna <kyle.manna@fuel7.com>
 *
 * 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	8

#define TCA8418_MAX_COLS	10

/* TCA8418 register offsets */

#define REG_CFG			0x01

#define REG_INT_STAT		0x02

#define REG_KEY_LCK_EC		0x03

#define REG_KEY_EVENT_A		0x04

#define REG_KEY_EVENT_B		0x05

#define REG_KEY_EVENT_C		0x06

#define REG_KEY_EVENT_D		0x07

#define REG_KEY_EVENT_E		0x08

#define REG_KEY_EVENT_F		0x09

#define REG_KEY_EVENT_G		0x0A

#define REG_KEY_EVENT_H		0x0B

#define REG_KEY_EVENT_I		0x0C

#define REG_KEY_EVENT_J		0x0D

#define REG_KP_LCK_TIMER	0x0E

#define REG_UNLOCK1		0x0F

#define REG_UNLOCK2		0x10

#define REG_GPIO_INT_STAT1	0x11

#define REG_GPIO_INT_STAT2	0x12

#define REG_GPIO_INT_STAT3	0x13

#define REG_GPIO_DAT_STAT1	0x14

#define REG_GPIO_DAT_STAT2	0x15

#define REG_GPIO_DAT_STAT3	0x16

#define REG_GPIO_DAT_OUT1	0x17

#define REG_GPIO_DAT_OUT2	0x18

#define REG_GPIO_DAT_OUT3	0x19

#define REG_GPIO_INT_EN1	0x1A

#define REG_GPIO_INT_EN2	0x1B

#define REG_GPIO_INT_EN3	0x1C

#define REG_KP_GPIO1		0x1D

#define REG_KP_GPIO2		0x1E

#define REG_KP_GPIO3		0x1F

#define REG_GPI_EM1		0x20

#define REG_GPI_EM2		0x21

#define REG_GPI_EM3		0x22

#define REG_GPIO_DIR1		0x23

#define REG_GPIO_DIR2		0x24

#define REG_GPIO_DIR3		0x25

#define REG_GPIO_INT_LVL1	0x26

#define REG_GPIO_INT_LVL2	0x27

#define REG_GPIO_INT_LVL3	0x28

#define REG_DEBOUNCE_DIS1	0x29

#define REG_DEBOUNCE_DIS2	0x2A

#define REG_DEBOUNCE_DIS3	0x2B

#define REG_GPIO_PULL1		0x2C

#define REG_GPIO_PULL2		0x2D

#define REG_GPIO_PULL3		0x2E

/* TCA8418 bit definitions */

#define CFG_AI			BIT(7)

#define CFG_GPI_E_CFG		BIT(6)

#define CFG_OVR_FLOW_M		BIT(5)

#define CFG_INT_CFG		BIT(4)

#define CFG_OVR_FLOW_IEN	BIT(3)

#define CFG_K_LCK_IEN		BIT(2)

#define CFG_GPI_IEN		BIT(1)

#define CFG_KE_IEN		BIT(0)


#define INT_STAT_CAD_INT	BIT(4)

#define INT_STAT_OVR_FLOW_INT	BIT(3)

#define INT_STAT_K_LCK_INT	BIT(2)

#define INT_STAT_GPI_INT	BIT(1)

#define INT_STAT_K_INT		BIT(0)

/* TCA8418 register masks */

#define KEY_LCK_EC_KEC		0x7

#define KEY_EVENT_CODE		0x7f

#define KEY_EVENT_VALUE		0x80


struct tca8418_keypad {
	
struct i2c_client *client;
	
struct input_dev *input;

	
unsigned int row_shift;
};

/*
 * Write a byte to the TCA8418
 */

static int tca8418_write_byte(struct tca8418_keypad *keypad_data, int reg, u8 val) { int error; error = i2c_smbus_write_byte_data(keypad_data->client, reg, val); if (error < 0) { dev_err(&keypad_data->client->dev, "%s failed, reg: %d, val: %d, error: %d\n", __func__, reg, val, error); return error; } return 0; }

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Kyle Manna67100.00%1100.00%
Total67100.00%1100.00%

/* * Read a byte from the TCA8418 */
static int tca8418_read_byte(struct tca8418_keypad *keypad_data, int reg, u8 *val) { int error; error = i2c_smbus_read_byte_data(keypad_data->client, reg); if (error < 0) { dev_err(&keypad_data->client->dev, "%s failed, reg: %d, error: %d\n", __func__, reg, error); return error; } *val = (u8)error; return 0; }

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static void tca8418_read_keypad(struct tca8418_keypad *keypad_data) { struct input_dev *input = keypad_data->input; unsigned short *keymap = input->keycode; int error, col, row; u8 reg, state, code; do { error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg); if (error < 0) { dev_err(&keypad_data->client->dev, "unable to read REG_KEY_EVENT_A\n"); break; } /* Assume that key code 0 signifies empty FIFO */ if (reg <= 0) break; state = reg & KEY_EVENT_VALUE; code = reg & KEY_EVENT_CODE; row = code / TCA8418_MAX_COLS; col = code % TCA8418_MAX_COLS; row = (col) ? row : row - 1; col = (col) ? col - 1 : TCA8418_MAX_COLS - 1; code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift); input_event(input, EV_MSC, MSC_SCAN, code); input_report_key(input, keymap[code], state); /* Read for next loop */ error = tca8418_read_byte(keypad_data, REG_KEY_EVENT_A, &reg); } while (1); input_sync(input); }

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Kyle Manna15076.53%133.33%
Arnd Bergmann2814.29%133.33%
Dmitry Torokhov189.18%133.33%
Total196100.00%3100.00%

/* * Threaded IRQ handler and this can (and will) sleep. */
static irqreturn_t tca8418_irq_handler(int irq, void *dev_id) { struct tca8418_keypad *keypad_data = dev_id; u8 reg; int error; error = tca8418_read_byte(keypad_data, REG_INT_STAT, &reg); if (error) { dev_err(&keypad_data->client->dev, "unable to read REG_INT_STAT\n"); return IRQ_NONE; } if (!reg) return IRQ_NONE; if (reg & INT_STAT_OVR_FLOW_INT) dev_warn(&keypad_data->client->dev, "overflow occurred\n"); if (reg & INT_STAT_K_INT) tca8418_read_keypad(keypad_data); /* Clear all interrupts, even IRQs we didn't check (GPI, CAD, LCK) */ reg = 0xff; error = tca8418_write_byte(keypad_data, REG_INT_STAT, reg); if (error) dev_err(&keypad_data->client->dev, "unable to clear REG_INT_STAT\n"); return IRQ_HANDLED; }

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Kyle Manna12091.60%150.00%
Alban Bedel118.40%150.00%
Total131100.00%2100.00%

/* * Configure the TCA8418 for keypad operation */
static int tca8418_configure(struct tca8418_keypad *keypad_data, u32 rows, u32 cols) { int reg, error; /* Write config register, if this fails assume device not present */ error = tca8418_write_byte(keypad_data, REG_CFG, CFG_INT_CFG | CFG_OVR_FLOW_IEN | CFG_KE_IEN); if (error < 0) return -ENODEV; /* Assemble a mask for row and column registers */ reg = ~(~0 << rows); reg += (~(~0 << cols)) << 8; /* Set registers to keypad mode */ error |= tca8418_write_byte(keypad_data, REG_KP_GPIO1, reg); error |= tca8418_write_byte(keypad_data, REG_KP_GPIO2, reg >> 8); error |= tca8418_write_byte(keypad_data, REG_KP_GPIO3, reg >> 16); /* Enable column debouncing */ error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS1, reg); error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS2, reg >> 8); error |= tca8418_write_byte(keypad_data, REG_DEBOUNCE_DIS3, reg >> 16); return error; }

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Kyle Manna14696.05%150.00%
Alban Bedel63.95%150.00%
Total152100.00%2100.00%


static int tca8418_keypad_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct tca8418_keypad *keypad_data; struct input_dev *input; u32 rows = 0, cols = 0; int error, row_shift, max_keys; /* Check i2c driver capabilities */ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) { dev_err(dev, "%s adapter not supported\n", dev_driver_string(&client->adapter->dev)); return -ENODEV; } error = matrix_keypad_parse_properties(dev, &rows, &cols); if (error) return error; if (!rows || rows > TCA8418_MAX_ROWS) { dev_err(dev, "invalid rows\n"); return -EINVAL; } if (!cols || cols > TCA8418_MAX_COLS) { dev_err(dev, "invalid columns\n"); return -EINVAL; } row_shift = get_count_order(cols); max_keys = rows << row_shift; /* Allocate memory for keypad_data and input device */ keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL); if (!keypad_data) return -ENOMEM; keypad_data->client = client; keypad_data->row_shift = row_shift; /* Initialize the chip or fail if chip isn't present */ error = tca8418_configure(keypad_data, rows, cols); if (error < 0) return error; /* Configure input device */ input = devm_input_allocate_device(dev); if (!input) return -ENOMEM; keypad_data->input = input; input->name = client->name; input->id.bustype = BUS_I2C; input->id.vendor = 0x0001; input->id.product = 0x001; input->id.version = 0x0001; error = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL, input); if (error) { dev_err(dev, "Failed to build keymap\n"); return error; } if (device_property_read_bool(dev, "keypad,autorepeat")) __set_bit(EV_REP, input->evbit); input_set_capability(input, EV_MSC, MSC_SCAN); error = devm_request_threaded_irq(dev, client->irq, NULL, tca8418_irq_handler, IRQF_SHARED | IRQF_ONESHOT, client->name, keypad_data); if (error) { dev_err(dev, "Unable to claim irq %d; error %d\n", client->irq, error); return error; } error = input_register_device(input); if (error) { dev_err(dev, "Unable to register input device, error: %d\n", error); return error; } return 0; }

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Kyle Manna29569.91%19.09%
Dmitry Torokhov9121.56%654.55%
Alban Bedel286.64%218.18%
Simon Glass71.66%19.09%
Lars-Peter Clausen10.24%19.09%
Total422100.00%11100.00%

static const struct i2c_device_id tca8418_id[] = { { "tca8418", 8418, }, { } }; MODULE_DEVICE_TABLE(i2c, tca8418_id); static const struct of_device_id tca8418_dt_ids[] = { { .compatible = "ti,tca8418", }, { } }; MODULE_DEVICE_TABLE(of, tca8418_dt_ids); static struct i2c_driver tca8418_keypad_driver = { .driver = { .name = "tca8418_keypad", .of_match_table = tca8418_dt_ids, }, .probe = tca8418_keypad_probe, .id_table = tca8418_id, };
static int __init tca8418_keypad_init(void) { return i2c_add_driver(&tca8418_keypad_driver); }

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Kyle Manna16100.00%1100.00%
Total16100.00%1100.00%

subsys_initcall(tca8418_keypad_init);
static void __exit tca8418_keypad_exit(void) { i2c_del_driver(&tca8418_keypad_driver); }

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Kyle Manna15100.00%1100.00%
Total15100.00%1100.00%

module_exit(tca8418_keypad_exit); MODULE_AUTHOR("Kyle Manna <kyle.manna@fuel7.com>"); MODULE_DESCRIPTION("Keypad driver for TCA8418"); MODULE_LICENSE("GPL");

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Kyle Manna123882.86%17.69%
Dmitry Torokhov17011.38%753.85%
Alban Bedel503.35%215.38%
Arnd Bergmann281.87%17.69%
Simon Glass70.47%17.69%
Lars-Peter Clausen10.07%17.69%
Greg Kroah-Hartman0.00%00.00%
Total1494100.00%13100.00%
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