// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Freescale's 3-Axis Accelerometer MMA8450
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*
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* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/of_device.h>
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#define MMA8450_DRV_NAME "mma8450"
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#define MODE_CHANGE_DELAY_MS 100
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#define POLL_INTERVAL 100
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#define POLL_INTERVAL_MAX 500
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/* register definitions */
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#define MMA8450_STATUS 0x00
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#define MMA8450_STATUS_ZXYDR 0x08
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#define MMA8450_OUT_X8 0x01
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#define MMA8450_OUT_Y8 0x02
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#define MMA8450_OUT_Z8 0x03
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#define MMA8450_OUT_X_LSB 0x05
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#define MMA8450_OUT_X_MSB 0x06
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#define MMA8450_OUT_Y_LSB 0x07
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#define MMA8450_OUT_Y_MSB 0x08
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#define MMA8450_OUT_Z_LSB 0x09
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#define MMA8450_OUT_Z_MSB 0x0a
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#define MMA8450_XYZ_DATA_CFG 0x16
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#define MMA8450_CTRL_REG1 0x38
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#define MMA8450_CTRL_REG2 0x39
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static int mma8450_read(struct i2c_client *c, unsigned int off)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(c, off);
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if (ret < 0)
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dev_err(&c->dev,
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"failed to read register 0x%02x, error %d\n",
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off, ret);
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return ret;
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}
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static int mma8450_write(struct i2c_client *c, unsigned int off, u8 v)
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{
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int error;
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error = i2c_smbus_write_byte_data(c, off, v);
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if (error < 0) {
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dev_err(&c->dev,
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"failed to write to register 0x%02x, error %d\n",
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off, error);
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return error;
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}
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return 0;
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}
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static int mma8450_read_block(struct i2c_client *c, unsigned int off,
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u8 *buf, size_t size)
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{
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int err;
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err = i2c_smbus_read_i2c_block_data(c, off, size, buf);
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if (err < 0) {
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dev_err(&c->dev,
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"failed to read block data at 0x%02x, error %d\n",
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MMA8450_OUT_X_LSB, err);
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return err;
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}
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return 0;
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}
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static void mma8450_poll(struct input_dev *input)
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{
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struct i2c_client *c = input_get_drvdata(input);
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int x, y, z;
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int ret;
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u8 buf[6];
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ret = mma8450_read(c, MMA8450_STATUS);
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if (ret < 0)
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return;
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if (!(ret & MMA8450_STATUS_ZXYDR))
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return;
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ret = mma8450_read_block(c, MMA8450_OUT_X_LSB, buf, sizeof(buf));
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if (ret < 0)
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return;
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x = ((int)(s8)buf[1] << 4) | (buf[0] & 0xf);
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y = ((int)(s8)buf[3] << 4) | (buf[2] & 0xf);
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z = ((int)(s8)buf[5] << 4) | (buf[4] & 0xf);
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input_report_abs(input, ABS_X, x);
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input_report_abs(input, ABS_Y, y);
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input_report_abs(input, ABS_Z, z);
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input_sync(input);
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}
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/* Initialize the MMA8450 chip */
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static int mma8450_open(struct input_dev *input)
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{
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struct i2c_client *c = input_get_drvdata(input);
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int err;
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/* enable all events from X/Y/Z, no FIFO */
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err = mma8450_write(c, MMA8450_XYZ_DATA_CFG, 0x07);
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if (err)
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return err;
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/*
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* Sleep mode poll rate - 50Hz
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* System output data rate - 400Hz
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* Full scale selection - Active, +/- 2G
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*/
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err = mma8450_write(c, MMA8450_CTRL_REG1, 0x01);
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if (err)
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return err;
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msleep(MODE_CHANGE_DELAY_MS);
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return 0;
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}
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static void mma8450_close(struct input_dev *input)
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{
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struct i2c_client *c = input_get_drvdata(input);
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mma8450_write(c, MMA8450_CTRL_REG1, 0x00);
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mma8450_write(c, MMA8450_CTRL_REG2, 0x01);
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}
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/*
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* I2C init/probing/exit functions
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*/
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static int mma8450_probe(struct i2c_client *c,
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const struct i2c_device_id *id)
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{
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struct input_dev *input;
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int err;
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input = devm_input_allocate_device(&c->dev);
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if (!input)
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return -ENOMEM;
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input_set_drvdata(input, c);
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input->name = MMA8450_DRV_NAME;
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input->id.bustype = BUS_I2C;
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input->open = mma8450_open;
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input->close = mma8450_close;
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input_set_abs_params(input, ABS_X, -2048, 2047, 32, 32);
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input_set_abs_params(input, ABS_Y, -2048, 2047, 32, 32);
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input_set_abs_params(input, ABS_Z, -2048, 2047, 32, 32);
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err = input_setup_polling(input, mma8450_poll);
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if (err) {
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dev_err(&c->dev, "failed to set up polling\n");
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return err;
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}
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input_set_poll_interval(input, POLL_INTERVAL);
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input_set_max_poll_interval(input, POLL_INTERVAL_MAX);
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err = input_register_device(input);
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if (err) {
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dev_err(&c->dev, "failed to register input device\n");
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return err;
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}
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return 0;
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}
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static const struct i2c_device_id mma8450_id[] = {
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{ MMA8450_DRV_NAME, 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mma8450_id);
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static const struct of_device_id mma8450_dt_ids[] = {
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{ .compatible = "fsl,mma8450", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mma8450_dt_ids);
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static struct i2c_driver mma8450_driver = {
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.driver = {
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.name = MMA8450_DRV_NAME,
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.of_match_table = mma8450_dt_ids,
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},
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.probe = mma8450_probe,
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.id_table = mma8450_id,
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};
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module_i2c_driver(mma8450_driver);
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MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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MODULE_DESCRIPTION("MMA8450 3-Axis Accelerometer Driver");
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MODULE_LICENSE("GPL");
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