linux/drivers/input/keyboard/lm8333.c
Thomas Gleixner 84a14ae8c4 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 178
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 24 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528170026.162703968@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:29:19 -07:00

233 lines
5.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* LM8333 keypad driver
* Copyright (C) 2012 Wolfram Sang, Pengutronix <kernel@pengutronix.de>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/input/matrix_keypad.h>
#include <linux/input/lm8333.h>
#define LM8333_FIFO_READ 0x20
#define LM8333_DEBOUNCE 0x22
#define LM8333_READ_INT 0xD0
#define LM8333_ACTIVE 0xE4
#define LM8333_READ_ERROR 0xF0
#define LM8333_KEYPAD_IRQ (1 << 0)
#define LM8333_ERROR_IRQ (1 << 3)
#define LM8333_ERROR_KEYOVR 0x04
#define LM8333_ERROR_FIFOOVR 0x40
#define LM8333_FIFO_TRANSFER_SIZE 16
#define LM8333_NUM_ROWS 8
#define LM8333_NUM_COLS 16
#define LM8333_ROW_SHIFT 4
struct lm8333 {
struct i2c_client *client;
struct input_dev *input;
unsigned short keycodes[LM8333_NUM_ROWS << LM8333_ROW_SHIFT];
};
/* The accessors try twice because the first access may be needed for wakeup */
#define LM8333_READ_RETRIES 2
int lm8333_read8(struct lm8333 *lm8333, u8 cmd)
{
int retries = 0, ret;
do {
ret = i2c_smbus_read_byte_data(lm8333->client, cmd);
} while (ret < 0 && retries++ < LM8333_READ_RETRIES);
return ret;
}
int lm8333_write8(struct lm8333 *lm8333, u8 cmd, u8 val)
{
int retries = 0, ret;
do {
ret = i2c_smbus_write_byte_data(lm8333->client, cmd, val);
} while (ret < 0 && retries++ < LM8333_READ_RETRIES);
return ret;
}
int lm8333_read_block(struct lm8333 *lm8333, u8 cmd, u8 len, u8 *buf)
{
int retries = 0, ret;
do {
ret = i2c_smbus_read_i2c_block_data(lm8333->client,
cmd, len, buf);
} while (ret < 0 && retries++ < LM8333_READ_RETRIES);
return ret;
}
static void lm8333_key_handler(struct lm8333 *lm8333)
{
struct input_dev *input = lm8333->input;
u8 keys[LM8333_FIFO_TRANSFER_SIZE];
u8 code, pressed;
int i, ret;
ret = lm8333_read_block(lm8333, LM8333_FIFO_READ,
LM8333_FIFO_TRANSFER_SIZE, keys);
if (ret != LM8333_FIFO_TRANSFER_SIZE) {
dev_err(&lm8333->client->dev,
"Error %d while reading FIFO\n", ret);
return;
}
for (i = 0; i < LM8333_FIFO_TRANSFER_SIZE && keys[i]; i++) {
pressed = keys[i] & 0x80;
code = keys[i] & 0x7f;
input_event(input, EV_MSC, MSC_SCAN, code);
input_report_key(input, lm8333->keycodes[code], pressed);
}
input_sync(input);
}
static irqreturn_t lm8333_irq_thread(int irq, void *data)
{
struct lm8333 *lm8333 = data;
u8 status = lm8333_read8(lm8333, LM8333_READ_INT);
if (!status)
return IRQ_NONE;
if (status & LM8333_ERROR_IRQ) {
u8 err = lm8333_read8(lm8333, LM8333_READ_ERROR);
if (err & (LM8333_ERROR_KEYOVR | LM8333_ERROR_FIFOOVR)) {
u8 dummy[LM8333_FIFO_TRANSFER_SIZE];
lm8333_read_block(lm8333, LM8333_FIFO_READ,
LM8333_FIFO_TRANSFER_SIZE, dummy);
}
dev_err(&lm8333->client->dev, "Got error %02x\n", err);
}
if (status & LM8333_KEYPAD_IRQ)
lm8333_key_handler(lm8333);
return IRQ_HANDLED;
}
static int lm8333_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct lm8333_platform_data *pdata =
dev_get_platdata(&client->dev);
struct lm8333 *lm8333;
struct input_dev *input;
int err, active_time;
if (!pdata)
return -EINVAL;
active_time = pdata->active_time ?: 500;
if (active_time / 3 <= pdata->debounce_time / 3) {
dev_err(&client->dev, "Active time not big enough!\n");
return -EINVAL;
}
lm8333 = kzalloc(sizeof(*lm8333), GFP_KERNEL);
input = input_allocate_device();
if (!lm8333 || !input) {
err = -ENOMEM;
goto free_mem;
}
lm8333->client = client;
lm8333->input = input;
input->name = client->name;
input->dev.parent = &client->dev;
input->id.bustype = BUS_I2C;
input_set_capability(input, EV_MSC, MSC_SCAN);
err = matrix_keypad_build_keymap(pdata->matrix_data, NULL,
LM8333_NUM_ROWS, LM8333_NUM_COLS,
lm8333->keycodes, input);
if (err)
goto free_mem;
if (pdata->debounce_time) {
err = lm8333_write8(lm8333, LM8333_DEBOUNCE,
pdata->debounce_time / 3);
if (err)
dev_warn(&client->dev, "Unable to set debounce time\n");
}
if (pdata->active_time) {
err = lm8333_write8(lm8333, LM8333_ACTIVE,
pdata->active_time / 3);
if (err)
dev_warn(&client->dev, "Unable to set active time\n");
}
err = request_threaded_irq(client->irq, NULL, lm8333_irq_thread,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"lm8333", lm8333);
if (err)
goto free_mem;
err = input_register_device(input);
if (err)
goto free_irq;
i2c_set_clientdata(client, lm8333);
return 0;
free_irq:
free_irq(client->irq, lm8333);
free_mem:
input_free_device(input);
kfree(lm8333);
return err;
}
static int lm8333_remove(struct i2c_client *client)
{
struct lm8333 *lm8333 = i2c_get_clientdata(client);
free_irq(client->irq, lm8333);
input_unregister_device(lm8333->input);
kfree(lm8333);
return 0;
}
static const struct i2c_device_id lm8333_id[] = {
{ "lm8333", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm8333_id);
static struct i2c_driver lm8333_driver = {
.driver = {
.name = "lm8333",
},
.probe = lm8333_probe,
.remove = lm8333_remove,
.id_table = lm8333_id,
};
module_i2c_driver(lm8333_driver);
MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
MODULE_DESCRIPTION("LM8333 keyboard driver");
MODULE_LICENSE("GPL v2");