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v6.8
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  Driver for Freescale's 3-Axis Accelerometer MMA8450
  4 *
  5 *  Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/module.h>
 10#include <linux/slab.h>
 11#include <linux/delay.h>
 12#include <linux/i2c.h>
 13#include <linux/input.h>
 14#include <linux/mod_devicetable.h>
 15
 16#define MMA8450_DRV_NAME	"mma8450"
 17
 18#define MODE_CHANGE_DELAY_MS	100
 19#define POLL_INTERVAL		100
 20#define POLL_INTERVAL_MAX	500
 21
 22/* register definitions */
 23#define MMA8450_STATUS		0x00
 24#define MMA8450_STATUS_ZXYDR	0x08
 25
 26#define MMA8450_OUT_X8		0x01
 27#define MMA8450_OUT_Y8		0x02
 28#define MMA8450_OUT_Z8		0x03
 29
 30#define MMA8450_OUT_X_LSB	0x05
 31#define MMA8450_OUT_X_MSB	0x06
 32#define MMA8450_OUT_Y_LSB	0x07
 33#define MMA8450_OUT_Y_MSB	0x08
 34#define MMA8450_OUT_Z_LSB	0x09
 35#define MMA8450_OUT_Z_MSB	0x0a
 36
 37#define MMA8450_XYZ_DATA_CFG	0x16
 38
 39#define MMA8450_CTRL_REG1	0x38
 40#define MMA8450_CTRL_REG2	0x39
 41
 42static int mma8450_read(struct i2c_client *c, unsigned int off)
 
 
 
 
 
 
 43{
 
 44	int ret;
 45
 46	ret = i2c_smbus_read_byte_data(c, off);
 47	if (ret < 0)
 48		dev_err(&c->dev,
 49			"failed to read register 0x%02x, error %d\n",
 50			off, ret);
 51
 52	return ret;
 53}
 54
 55static int mma8450_write(struct i2c_client *c, unsigned int off, u8 v)
 56{
 
 57	int error;
 58
 59	error = i2c_smbus_write_byte_data(c, off, v);
 60	if (error < 0) {
 61		dev_err(&c->dev,
 62			"failed to write to register 0x%02x, error %d\n",
 63			off, error);
 64		return error;
 65	}
 66
 67	return 0;
 68}
 69
 70static int mma8450_read_block(struct i2c_client *c, unsigned int off,
 71			      u8 *buf, size_t size)
 72{
 
 
 73	int err;
 74
 75	err = i2c_smbus_read_i2c_block_data(c, off, size, buf);
 76	if (err < 0) {
 77		dev_err(&c->dev,
 78			"failed to read block data at 0x%02x, error %d\n",
 79			MMA8450_OUT_X_LSB, err);
 80		return err;
 81	}
 82
 
 
 
 
 83	return 0;
 84}
 85
 86static void mma8450_poll(struct input_dev *input)
 87{
 88	struct i2c_client *c = input_get_drvdata(input);
 89	int x, y, z;
 90	int ret;
 91	u8 buf[6];
 92
 93	ret = mma8450_read(c, MMA8450_STATUS);
 94	if (ret < 0)
 95		return;
 96
 97	if (!(ret & MMA8450_STATUS_ZXYDR))
 98		return;
 99
100	ret = mma8450_read_block(c, MMA8450_OUT_X_LSB, buf, sizeof(buf));
101	if (ret < 0)
102		return;
103
104	x = ((int)(s8)buf[1] << 4) | (buf[0] & 0xf);
105	y = ((int)(s8)buf[3] << 4) | (buf[2] & 0xf);
106	z = ((int)(s8)buf[5] << 4) | (buf[4] & 0xf);
107
108	input_report_abs(input, ABS_X, x);
109	input_report_abs(input, ABS_Y, y);
110	input_report_abs(input, ABS_Z, z);
111	input_sync(input);
112}
113
114/* Initialize the MMA8450 chip */
115static int mma8450_open(struct input_dev *input)
116{
117	struct i2c_client *c = input_get_drvdata(input);
118	int err;
119
120	/* enable all events from X/Y/Z, no FIFO */
121	err = mma8450_write(c, MMA8450_XYZ_DATA_CFG, 0x07);
122	if (err)
123		return err;
124
125	/*
126	 * Sleep mode poll rate - 50Hz
127	 * System output data rate - 400Hz
128	 * Full scale selection - Active, +/- 2G
129	 */
130	err = mma8450_write(c, MMA8450_CTRL_REG1, 0x01);
131	if (err)
132		return err;
133
134	msleep(MODE_CHANGE_DELAY_MS);
135	return 0;
136}
137
138static void mma8450_close(struct input_dev *input)
139{
140	struct i2c_client *c = input_get_drvdata(input);
141
142	mma8450_write(c, MMA8450_CTRL_REG1, 0x00);
143	mma8450_write(c, MMA8450_CTRL_REG2, 0x01);
144}
145
146/*
147 * I2C init/probing/exit functions
148 */
149static int mma8450_probe(struct i2c_client *c)
 
150{
151	struct input_dev *input;
 
152	int err;
153
154	input = devm_input_allocate_device(&c->dev);
155	if (!input)
156		return -ENOMEM;
157
158	input_set_drvdata(input, c);
159
160	input->name = MMA8450_DRV_NAME;
161	input->id.bustype = BUS_I2C;
162
163	input->open = mma8450_open;
164	input->close = mma8450_close;
165
166	input_set_abs_params(input, ABS_X, -2048, 2047, 32, 32);
167	input_set_abs_params(input, ABS_Y, -2048, 2047, 32, 32);
168	input_set_abs_params(input, ABS_Z, -2048, 2047, 32, 32);
 
 
 
 
 
 
 
 
 
 
169
170	err = input_setup_polling(input, mma8450_poll);
171	if (err) {
172		dev_err(&c->dev, "failed to set up polling\n");
173		return err;
174	}
175
176	input_set_poll_interval(input, POLL_INTERVAL);
177	input_set_max_poll_interval(input, POLL_INTERVAL_MAX);
178
179	err = input_register_device(input);
180	if (err) {
181		dev_err(&c->dev, "failed to register input device\n");
182		return err;
183	}
 
 
 
 
 
 
 
 
 
184
185	return 0;
186}
187
188static const struct i2c_device_id mma8450_id[] = {
189	{ MMA8450_DRV_NAME, 0 },
190	{ },
191};
192MODULE_DEVICE_TABLE(i2c, mma8450_id);
193
194static const struct of_device_id mma8450_dt_ids[] = {
195	{ .compatible = "fsl,mma8450", },
196	{ /* sentinel */ }
197};
198MODULE_DEVICE_TABLE(of, mma8450_dt_ids);
199
200static struct i2c_driver mma8450_driver = {
201	.driver = {
202		.name	= MMA8450_DRV_NAME,
 
203		.of_match_table = mma8450_dt_ids,
204	},
205	.probe		= mma8450_probe,
 
206	.id_table	= mma8450_id,
207};
208
209module_i2c_driver(mma8450_driver);
 
 
 
 
 
 
 
 
 
 
210
211MODULE_AUTHOR("Freescale Semiconductor, Inc.");
212MODULE_DESCRIPTION("MMA8450 3-Axis Accelerometer Driver");
213MODULE_LICENSE("GPL");
v3.1
 
  1/*
  2 *  Driver for Freescale's 3-Axis Accelerometer MMA8450
  3 *
  4 *  Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
  5 *
  6 *  This program is free software; you can redistribute it and/or modify
  7 *  it under the terms of the GNU General Public License as published by
  8 *  the Free Software Foundation; either version 2 of the License, or
  9 *  (at your option) any later version.
 10 *
 11 *  This program is distributed in the hope that it will be useful,
 12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 *  GNU General Public License for more details.
 15 *
 16 *  You should have received a copy of the GNU General Public License
 17 *  along with this program; if not, write to the Free Software
 18 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 19 */
 20
 21#include <linux/kernel.h>
 22#include <linux/module.h>
 23#include <linux/slab.h>
 24#include <linux/delay.h>
 25#include <linux/i2c.h>
 26#include <linux/input-polldev.h>
 27#include <linux/of_device.h>
 28
 29#define MMA8450_DRV_NAME	"mma8450"
 30
 31#define MODE_CHANGE_DELAY_MS	100
 32#define POLL_INTERVAL		100
 33#define POLL_INTERVAL_MAX	500
 34
 35/* register definitions */
 36#define MMA8450_STATUS		0x00
 37#define MMA8450_STATUS_ZXYDR	0x08
 38
 39#define MMA8450_OUT_X8		0x01
 40#define MMA8450_OUT_Y8		0x02
 41#define MMA8450_OUT_Z8		0x03
 42
 43#define MMA8450_OUT_X_LSB	0x05
 44#define MMA8450_OUT_X_MSB	0x06
 45#define MMA8450_OUT_Y_LSB	0x07
 46#define MMA8450_OUT_Y_MSB	0x08
 47#define MMA8450_OUT_Z_LSB	0x09
 48#define MMA8450_OUT_Z_MSB	0x0a
 49
 50#define MMA8450_XYZ_DATA_CFG	0x16
 51
 52#define MMA8450_CTRL_REG1	0x38
 53#define MMA8450_CTRL_REG2	0x39
 54
 55/* mma8450 status */
 56struct mma8450 {
 57	struct i2c_client	*client;
 58	struct input_polled_dev	*idev;
 59};
 60
 61static int mma8450_read(struct mma8450 *m, unsigned off)
 62{
 63	struct i2c_client *c = m->client;
 64	int ret;
 65
 66	ret = i2c_smbus_read_byte_data(c, off);
 67	if (ret < 0)
 68		dev_err(&c->dev,
 69			"failed to read register 0x%02x, error %d\n",
 70			off, ret);
 71
 72	return ret;
 73}
 74
 75static int mma8450_write(struct mma8450 *m, unsigned off, u8 v)
 76{
 77	struct i2c_client *c = m->client;
 78	int error;
 79
 80	error = i2c_smbus_write_byte_data(c, off, v);
 81	if (error < 0) {
 82		dev_err(&c->dev,
 83			"failed to write to register 0x%02x, error %d\n",
 84			off, error);
 85		return error;
 86	}
 87
 88	return 0;
 89}
 90
 91static int mma8450_read_xyz(struct mma8450 *m, int *x, int *y, int *z)
 
 92{
 93	struct i2c_client *c = m->client;
 94	u8 buff[6];
 95	int err;
 96
 97	err = i2c_smbus_read_i2c_block_data(c, MMA8450_OUT_X_LSB, 6, buff);
 98	if (err < 0) {
 99		dev_err(&c->dev,
100			"failed to read block data at 0x%02x, error %d\n",
101			MMA8450_OUT_X_LSB, err);
102		return err;
103	}
104
105	*x = ((buff[1] << 4) & 0xff0) | (buff[0] & 0xf);
106	*y = ((buff[3] << 4) & 0xff0) | (buff[2] & 0xf);
107	*z = ((buff[5] << 4) & 0xff0) | (buff[4] & 0xf);
108
109	return 0;
110}
111
112static void mma8450_poll(struct input_polled_dev *dev)
113{
114	struct mma8450 *m = dev->private;
115	int x, y, z;
116	int ret;
117	int err;
118
119	ret = mma8450_read(m, MMA8450_STATUS);
120	if (ret < 0)
121		return;
122
123	if (!(ret & MMA8450_STATUS_ZXYDR))
124		return;
125
126	err = mma8450_read_xyz(m, &x, &y, &z);
127	if (err)
128		return;
129
130	input_report_abs(dev->input, ABS_X, x);
131	input_report_abs(dev->input, ABS_Y, y);
132	input_report_abs(dev->input, ABS_Z, z);
133	input_sync(dev->input);
 
 
 
 
134}
135
136/* Initialize the MMA8450 chip */
137static void mma8450_open(struct input_polled_dev *dev)
138{
139	struct mma8450 *m = dev->private;
140	int err;
141
142	/* enable all events from X/Y/Z, no FIFO */
143	err = mma8450_write(m, MMA8450_XYZ_DATA_CFG, 0x07);
144	if (err)
145		return;
146
147	/*
148	 * Sleep mode poll rate - 50Hz
149	 * System output data rate - 400Hz
150	 * Full scale selection - Active, +/- 2G
151	 */
152	err = mma8450_write(m, MMA8450_CTRL_REG1, 0x01);
153	if (err < 0)
154		return;
155
156	msleep(MODE_CHANGE_DELAY_MS);
 
157}
158
159static void mma8450_close(struct input_polled_dev *dev)
160{
161	struct mma8450 *m = dev->private;
162
163	mma8450_write(m, MMA8450_CTRL_REG1, 0x00);
164	mma8450_write(m, MMA8450_CTRL_REG2, 0x01);
165}
166
167/*
168 * I2C init/probing/exit functions
169 */
170static int __devinit mma8450_probe(struct i2c_client *c,
171				   const struct i2c_device_id *id)
172{
173	struct input_polled_dev *idev;
174	struct mma8450 *m;
175	int err;
176
177	m = kzalloc(sizeof(struct mma8450), GFP_KERNEL);
178	idev = input_allocate_polled_device();
179	if (!m || !idev) {
180		err = -ENOMEM;
181		goto err_free_mem;
182	}
 
 
183
184	m->client = c;
185	m->idev = idev;
186
187	idev->private		= m;
188	idev->input->name	= MMA8450_DRV_NAME;
189	idev->input->id.bustype	= BUS_I2C;
190	idev->poll		= mma8450_poll;
191	idev->poll_interval	= POLL_INTERVAL;
192	idev->poll_interval_max	= POLL_INTERVAL_MAX;
193	idev->open		= mma8450_open;
194	idev->close		= mma8450_close;
195
196	__set_bit(EV_ABS, idev->input->evbit);
197	input_set_abs_params(idev->input, ABS_X, -2048, 2047, 32, 32);
198	input_set_abs_params(idev->input, ABS_Y, -2048, 2047, 32, 32);
199	input_set_abs_params(idev->input, ABS_Z, -2048, 2047, 32, 32);
200
201	err = input_register_polled_device(idev);
202	if (err) {
203		dev_err(&c->dev, "failed to register polled input device\n");
204		goto err_free_mem;
205	}
206
207	return 0;
 
208
209err_free_mem:
210	input_free_polled_device(idev);
211	kfree(m);
212	return err;
213}
214
215static int __devexit mma8450_remove(struct i2c_client *c)
216{
217	struct mma8450 *m = i2c_get_clientdata(c);
218	struct input_polled_dev *idev = m->idev;
219
220	input_unregister_polled_device(idev);
221	input_free_polled_device(idev);
222	kfree(m);
223
224	return 0;
225}
226
227static const struct i2c_device_id mma8450_id[] = {
228	{ MMA8450_DRV_NAME, 0 },
229	{ },
230};
231MODULE_DEVICE_TABLE(i2c, mma8450_id);
232
233static const struct of_device_id mma8450_dt_ids[] = {
234	{ .compatible = "fsl,mma8450", },
235	{ /* sentinel */ }
236};
237MODULE_DEVICE_TABLE(of, mma8450_dt_ids);
238
239static struct i2c_driver mma8450_driver = {
240	.driver = {
241		.name	= MMA8450_DRV_NAME,
242		.owner	= THIS_MODULE,
243		.of_match_table = mma8450_dt_ids,
244	},
245	.probe		= mma8450_probe,
246	.remove		= __devexit_p(mma8450_remove),
247	.id_table	= mma8450_id,
248};
249
250static int __init mma8450_init(void)
251{
252	return i2c_add_driver(&mma8450_driver);
253}
254module_init(mma8450_init);
255
256static void __exit mma8450_exit(void)
257{
258	i2c_del_driver(&mma8450_driver);
259}
260module_exit(mma8450_exit);
261
262MODULE_AUTHOR("Freescale Semiconductor, Inc.");
263MODULE_DESCRIPTION("MMA8450 3-Axis Accelerometer Driver");
264MODULE_LICENSE("GPL");