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-rw-r--r--drivers/input/misc/mma8450.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/input/misc/mma8450.c b/drivers/input/misc/mma8450.c
new file mode 100644
index 000000000..1b5a5e192
--- /dev/null
+++ b/drivers/input/misc/mma8450.c
@@ -0,0 +1,214 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Freescale's 3-Axis Accelerometer MMA8450
+ *
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/of_device.h>
+
+#define MMA8450_DRV_NAME "mma8450"
+
+#define MODE_CHANGE_DELAY_MS 100
+#define POLL_INTERVAL 100
+#define POLL_INTERVAL_MAX 500
+
+/* register definitions */
+#define MMA8450_STATUS 0x00
+#define MMA8450_STATUS_ZXYDR 0x08
+
+#define MMA8450_OUT_X8 0x01
+#define MMA8450_OUT_Y8 0x02
+#define MMA8450_OUT_Z8 0x03
+
+#define MMA8450_OUT_X_LSB 0x05
+#define MMA8450_OUT_X_MSB 0x06
+#define MMA8450_OUT_Y_LSB 0x07
+#define MMA8450_OUT_Y_MSB 0x08
+#define MMA8450_OUT_Z_LSB 0x09
+#define MMA8450_OUT_Z_MSB 0x0a
+
+#define MMA8450_XYZ_DATA_CFG 0x16
+
+#define MMA8450_CTRL_REG1 0x38
+#define MMA8450_CTRL_REG2 0x39
+
+static int mma8450_read(struct i2c_client *c, unsigned int off)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(c, off);
+ if (ret < 0)
+ dev_err(&c->dev,
+ "failed to read register 0x%02x, error %d\n",
+ off, ret);
+
+ return ret;
+}
+
+static int mma8450_write(struct i2c_client *c, unsigned int off, u8 v)
+{
+ int error;
+
+ error = i2c_smbus_write_byte_data(c, off, v);
+ if (error < 0) {
+ dev_err(&c->dev,
+ "failed to write to register 0x%02x, error %d\n",
+ off, error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int mma8450_read_block(struct i2c_client *c, unsigned int off,
+ u8 *buf, size_t size)
+{
+ int err;
+
+ err = i2c_smbus_read_i2c_block_data(c, off, size, buf);
+ if (err < 0) {
+ dev_err(&c->dev,
+ "failed to read block data at 0x%02x, error %d\n",
+ MMA8450_OUT_X_LSB, err);
+ return err;
+ }
+
+ return 0;
+}
+
+static void mma8450_poll(struct input_dev *input)
+{
+ struct i2c_client *c = input_get_drvdata(input);
+ int x, y, z;
+ int ret;
+ u8 buf[6];
+
+ ret = mma8450_read(c, MMA8450_STATUS);
+ if (ret < 0)
+ return;
+
+ if (!(ret & MMA8450_STATUS_ZXYDR))
+ return;
+
+ ret = mma8450_read_block(c, MMA8450_OUT_X_LSB, buf, sizeof(buf));
+ if (ret < 0)
+ return;
+
+ x = ((int)(s8)buf[1] << 4) | (buf[0] & 0xf);
+ y = ((int)(s8)buf[3] << 4) | (buf[2] & 0xf);
+ z = ((int)(s8)buf[5] << 4) | (buf[4] & 0xf);
+
+ input_report_abs(input, ABS_X, x);
+ input_report_abs(input, ABS_Y, y);
+ input_report_abs(input, ABS_Z, z);
+ input_sync(input);
+}
+
+/* Initialize the MMA8450 chip */
+static int mma8450_open(struct input_dev *input)
+{
+ struct i2c_client *c = input_get_drvdata(input);
+ int err;
+
+ /* enable all events from X/Y/Z, no FIFO */
+ err = mma8450_write(c, MMA8450_XYZ_DATA_CFG, 0x07);
+ if (err)
+ return err;
+
+ /*
+ * Sleep mode poll rate - 50Hz
+ * System output data rate - 400Hz
+ * Full scale selection - Active, +/- 2G
+ */
+ err = mma8450_write(c, MMA8450_CTRL_REG1, 0x01);
+ if (err)
+ return err;
+
+ msleep(MODE_CHANGE_DELAY_MS);
+ return 0;
+}
+
+static void mma8450_close(struct input_dev *input)
+{
+ struct i2c_client *c = input_get_drvdata(input);
+
+ mma8450_write(c, MMA8450_CTRL_REG1, 0x00);
+ mma8450_write(c, MMA8450_CTRL_REG2, 0x01);
+}
+
+/*
+ * I2C init/probing/exit functions
+ */
+static int mma8450_probe(struct i2c_client *c,
+ const struct i2c_device_id *id)
+{
+ struct input_dev *input;
+ int err;
+
+ input = devm_input_allocate_device(&c->dev);
+ if (!input)
+ return -ENOMEM;
+
+ input_set_drvdata(input, c);
+
+ input->name = MMA8450_DRV_NAME;
+ input->id.bustype = BUS_I2C;
+
+ input->open = mma8450_open;
+ input->close = mma8450_close;
+
+ input_set_abs_params(input, ABS_X, -2048, 2047, 32, 32);
+ input_set_abs_params(input, ABS_Y, -2048, 2047, 32, 32);
+ input_set_abs_params(input, ABS_Z, -2048, 2047, 32, 32);
+
+ err = input_setup_polling(input, mma8450_poll);
+ if (err) {
+ dev_err(&c->dev, "failed to set up polling\n");
+ return err;
+ }
+
+ input_set_poll_interval(input, POLL_INTERVAL);
+ input_set_max_poll_interval(input, POLL_INTERVAL_MAX);
+
+ err = input_register_device(input);
+ if (err) {
+ dev_err(&c->dev, "failed to register input device\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id mma8450_id[] = {
+ { MMA8450_DRV_NAME, 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, mma8450_id);
+
+static const struct of_device_id mma8450_dt_ids[] = {
+ { .compatible = "fsl,mma8450", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mma8450_dt_ids);
+
+static struct i2c_driver mma8450_driver = {
+ .driver = {
+ .name = MMA8450_DRV_NAME,
+ .of_match_table = mma8450_dt_ids,
+ },
+ .probe = mma8450_probe,
+ .id_table = mma8450_id,
+};
+
+module_i2c_driver(mma8450_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MMA8450 3-Axis Accelerometer Driver");
+MODULE_LICENSE("GPL");