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path: root/drivers/input/misc/mma8450.c
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Diffstat (limited to 'drivers/input/misc/mma8450.c')
-rw-r--r--drivers/input/misc/mma8450.c161
1 files changed, 67 insertions, 94 deletions
diff --git a/drivers/input/misc/mma8450.c b/drivers/input/misc/mma8450.c
index f3309696d053..0c661140fb88 100644
--- a/drivers/input/misc/mma8450.c
+++ b/drivers/input/misc/mma8450.c
@@ -1,21 +1,8 @@
+// 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.
- *
- * 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, or
- * (at your option) any later version.
- *
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
@@ -23,8 +10,8 @@
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/i2c.h>
-#include <linux/input-polldev.h>
-#include <linux/of_device.h>
+#include <linux/input.h>
+#include <linux/mod_devicetable.h>
#define MMA8450_DRV_NAME "mma8450"
@@ -51,16 +38,11 @@
#define MMA8450_CTRL_REG1 0x38
#define MMA8450_CTRL_REG2 0x39
+#define MMA8450_ID 0xc6
+#define MMA8450_WHO_AM_I 0x0f
-/* mma8450 status */
-struct mma8450 {
- struct i2c_client *client;
- struct input_polled_dev *idev;
-};
-
-static int mma8450_read(struct mma8450 *m, unsigned off)
+static int mma8450_read(struct i2c_client *c, unsigned int off)
{
- struct i2c_client *c = m->client;
int ret;
ret = i2c_smbus_read_byte_data(c, off);
@@ -72,9 +54,8 @@ static int mma8450_read(struct mma8450 *m, unsigned off)
return ret;
}
-static int mma8450_write(struct mma8450 *m, unsigned off, u8 v)
+static int mma8450_write(struct i2c_client *c, unsigned int off, u8 v)
{
- struct i2c_client *c = m->client;
int error;
error = i2c_smbus_write_byte_data(c, off, v);
@@ -88,10 +69,9 @@ static int mma8450_write(struct mma8450 *m, unsigned off, u8 v)
return 0;
}
-static int mma8450_read_block(struct mma8450 *m, unsigned off,
+static int mma8450_read_block(struct i2c_client *c, unsigned int off,
u8 *buf, size_t size)
{
- struct i2c_client *c = m->client;
int err;
err = i2c_smbus_read_i2c_block_data(c, off, size, buf);
@@ -105,21 +85,21 @@ static int mma8450_read_block(struct mma8450 *m, unsigned off,
return 0;
}
-static void mma8450_poll(struct input_polled_dev *dev)
+static void mma8450_poll(struct input_dev *input)
{
- struct mma8450 *m = dev->private;
+ struct i2c_client *c = input_get_drvdata(input);
int x, y, z;
int ret;
u8 buf[6];
- ret = mma8450_read(m, MMA8450_STATUS);
+ ret = mma8450_read(c, MMA8450_STATUS);
if (ret < 0)
return;
if (!(ret & MMA8450_STATUS_ZXYDR))
return;
- ret = mma8450_read_block(m, MMA8450_OUT_X_LSB, buf, sizeof(buf));
+ ret = mma8450_read_block(c, MMA8450_OUT_X_LSB, buf, sizeof(buf));
if (ret < 0)
return;
@@ -127,106 +107,101 @@ static void mma8450_poll(struct input_polled_dev *dev)
y = ((int)(s8)buf[3] << 4) | (buf[2] & 0xf);
z = ((int)(s8)buf[5] << 4) | (buf[4] & 0xf);
- input_report_abs(dev->input, ABS_X, x);
- input_report_abs(dev->input, ABS_Y, y);
- input_report_abs(dev->input, ABS_Z, z);
- input_sync(dev->input);
+ 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 void mma8450_open(struct input_polled_dev *dev)
+static int mma8450_open(struct input_dev *input)
{
- struct mma8450 *m = dev->private;
+ struct i2c_client *c = input_get_drvdata(input);
int err;
/* enable all events from X/Y/Z, no FIFO */
- err = mma8450_write(m, MMA8450_XYZ_DATA_CFG, 0x07);
+ err = mma8450_write(c, MMA8450_XYZ_DATA_CFG, 0x07);
if (err)
- return;
+ return err;
/*
* Sleep mode poll rate - 50Hz
* System output data rate - 400Hz
* Full scale selection - Active, +/- 2G
*/
- err = mma8450_write(m, MMA8450_CTRL_REG1, 0x01);
- if (err < 0)
- return;
+ 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_polled_dev *dev)
+static void mma8450_close(struct input_dev *input)
{
- struct mma8450 *m = dev->private;
+ struct i2c_client *c = input_get_drvdata(input);
- mma8450_write(m, MMA8450_CTRL_REG1, 0x00);
- mma8450_write(m, MMA8450_CTRL_REG2, 0x01);
+ 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)
+static int mma8450_probe(struct i2c_client *c)
{
- struct input_polled_dev *idev;
- struct mma8450 *m;
- int err;
+ struct i2c_adapter *adapter = c->adapter;
+ struct input_dev *input;
+ int err, client_id;
- m = kzalloc(sizeof(struct mma8450), GFP_KERNEL);
- idev = input_allocate_polled_device();
- if (!m || !idev) {
- err = -ENOMEM;
- goto err_free_mem;
- }
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA))
+ return dev_err_probe(&c->dev, -EINVAL,
+ "I2C adapter doesn't support SMBUS BYTE");
- m->client = c;
- m->idev = idev;
+ client_id = i2c_smbus_read_byte_data(c, MMA8450_WHO_AM_I);
+ if (client_id != MMA8450_ID)
+ return dev_err_probe(&c->dev, -EINVAL,
+ "unexpected chip ID 0x%x (vs 0x%x)\n",
+ client_id, MMA8450_ID);
- idev->private = m;
- idev->input->name = MMA8450_DRV_NAME;
- idev->input->id.bustype = BUS_I2C;
- idev->poll = mma8450_poll;
- idev->poll_interval = POLL_INTERVAL;
- idev->poll_interval_max = POLL_INTERVAL_MAX;
- idev->open = mma8450_open;
- idev->close = mma8450_close;
+ input = devm_input_allocate_device(&c->dev);
+ if (!input)
+ return -ENOMEM;
- __set_bit(EV_ABS, idev->input->evbit);
- input_set_abs_params(idev->input, ABS_X, -2048, 2047, 32, 32);
- input_set_abs_params(idev->input, ABS_Y, -2048, 2047, 32, 32);
- input_set_abs_params(idev->input, ABS_Z, -2048, 2047, 32, 32);
+ input_set_drvdata(input, c);
- err = input_register_polled_device(idev);
- if (err) {
- dev_err(&c->dev, "failed to register polled input device\n");
- goto err_free_mem;
- }
+ input->name = MMA8450_DRV_NAME;
+ input->id.bustype = BUS_I2C;
- return 0;
+ input->open = mma8450_open;
+ input->close = mma8450_close;
-err_free_mem:
- input_free_polled_device(idev);
- kfree(m);
- return err;
-}
+ 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);
-static int mma8450_remove(struct i2c_client *c)
-{
- struct mma8450 *m = i2c_get_clientdata(c);
- struct input_polled_dev *idev = m->idev;
+ 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);
- input_unregister_polled_device(idev);
- input_free_polled_device(idev);
- kfree(m);
+ 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 },
- { },
+ { MMA8450_DRV_NAME },
+ { }
};
MODULE_DEVICE_TABLE(i2c, mma8450_id);
@@ -239,11 +214,9 @@ MODULE_DEVICE_TABLE(of, mma8450_dt_ids);
static struct i2c_driver mma8450_driver = {
.driver = {
.name = MMA8450_DRV_NAME,
- .owner = THIS_MODULE,
.of_match_table = mma8450_dt_ids,
},
.probe = mma8450_probe,
- .remove = mma8450_remove,
.id_table = mma8450_id,
};
generated by cgit (git 2.34.1) at 2025-12-25 10:34:18 +0000