MLK-11469-01 hwmon: mma8451: Add mma8451 driver support on i.MX6Q/DL/SX platform.

Add mma8451 driver support for i.MX6Q/DL/SX platform. The code derives from 3.10.y branch.

Signed-off-by: Luwei Zhou <b45643@freescale.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
(cherry picked from commit: 69e1811b92ed7b3dc2f1db0a9447a8570dd16231)

1 files changed, 598 insertions, 0 deletions

diff --git a/drivers/hwmon/mxc_mma8451.c b/drivers/hwmon/mxc_mma8451.c
new file mode 100644
index 000000000000..f20fb8e5ef78
--- /dev/null
+++ b/drivers/hwmon/mxc_mma8451.c
@@ -0,0 +1,598 @@
+/*
+ *  mma8451.c - Linux kernel modules for 3-Axis Orientation/Motion
+ *  Detection Sensor
+ *
+ *  Copyright (C) 2010-2014 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/pm.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/input-polldev.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#define MMA8451_I2C_ADDR	0x1C
+#define MMA8451_ID		0x1A
+#define MMA8452_ID		0x2A
+#define MMA8453_ID		0x3A
+
+#define POLL_INTERVAL_MIN	1
+#define POLL_INTERVAL_MAX	500
+#define POLL_INTERVAL		100	/* msecs */
+#define INPUT_FUZZ		32
+#define INPUT_FLAT		32
+#define MODE_CHANGE_DELAY_MS	100
+
+#define MMA8451_STATUS_ZYXDR	0x08
+#define MMA8451_BUF_SIZE	7
+#define DEFAULT_POSITION	0
+
+/* register enum for mma8451 registers */
+enum {
+	MMA8451_STATUS = 0x00,
+	MMA8451_OUT_X_MSB,
+	MMA8451_OUT_X_LSB,
+	MMA8451_OUT_Y_MSB,
+	MMA8451_OUT_Y_LSB,
+	MMA8451_OUT_Z_MSB,
+	MMA8451_OUT_Z_LSB,
+
+	MMA8451_F_SETUP = 0x09,
+	MMA8451_TRIG_CFG,
+	MMA8451_SYSMOD,
+	MMA8451_INT_SOURCE,
+	MMA8451_WHO_AM_I,
+	MMA8451_XYZ_DATA_CFG,
+	MMA8451_HP_FILTER_CUTOFF,
+
+	MMA8451_PL_STATUS,
+	MMA8451_PL_CFG,
+	MMA8451_PL_COUNT,
+	MMA8451_PL_BF_ZCOMP,
+	MMA8451_P_L_THS_REG,
+
+	MMA8451_FF_MT_CFG,
+	MMA8451_FF_MT_SRC,
+	MMA8451_FF_MT_THS,
+	MMA8451_FF_MT_COUNT,
+
+	MMA8451_TRANSIENT_CFG = 0x1D,
+	MMA8451_TRANSIENT_SRC,
+	MMA8451_TRANSIENT_THS,
+	MMA8451_TRANSIENT_COUNT,
+
+	MMA8451_PULSE_CFG,
+	MMA8451_PULSE_SRC,
+	MMA8451_PULSE_THSX,
+	MMA8451_PULSE_THSY,
+	MMA8451_PULSE_THSZ,
+	MMA8451_PULSE_TMLT,
+	MMA8451_PULSE_LTCY,
+	MMA8451_PULSE_WIND,
+
+	MMA8451_ASLP_COUNT,
+	MMA8451_CTRL_REG1,
+	MMA8451_CTRL_REG2,
+	MMA8451_CTRL_REG3,
+	MMA8451_CTRL_REG4,
+	MMA8451_CTRL_REG5,
+
+	MMA8451_OFF_X,
+	MMA8451_OFF_Y,
+	MMA8451_OFF_Z,
+
+	MMA8451_REG_END,
+};
+
+/* The sensitivity is represented in counts/g. In 2g mode the
+sensitivity is 1024 counts/g. In 4g mode the sensitivity is 512
+counts/g and in 8g mode the sensitivity is 256 counts/g.
+ */
+enum {
+	MODE_2G = 0,
+	MODE_4G,
+	MODE_8G,
+};
+
+enum {
+	MMA_STANDBY = 0,
+	MMA_ACTIVED,
+};
+
+/* mma8451 status */
+struct mma8451_status {
+	u8 mode;
+	u8 ctl_reg1;
+	int active;
+	int position;
+};
+
+static struct mma8451_status mma_status;
+static struct input_polled_dev *mma8451_idev;
+static struct device *hwmon_dev;
+static struct i2c_client *mma8451_i2c_client;
+
+static int senstive_mode = MODE_2G;
+static int ACCHAL[8][3][3] = {
+	{ {0, -1, 0}, {1, 0, 0}, {0, 0, 1} },
+	{ {-1, 0, 0}, {0, -1, 0}, {0, 0, 1} },
+	{ {0, 1, 0}, {-1, 0, 0}, {0, 0, 1} },
+	{ {1, 0, 0}, {0, 1, 0}, {0, 0, 1} },
+
+	{ {0, -1, 0}, {-1, 0, 0}, {0, 0, -1} },
+	{ {-1, 0, 0}, {0, 1, 0}, {0, 0, -1} },
+	{ {0, 1, 0}, {1, 0, 0}, {0, 0, -1} },
+	{ {1, 0, 0}, {0, -1, 0}, {0, 0, -1} },
+};
+
+static DEFINE_MUTEX(mma8451_lock);
+static int mma8451_adjust_position(short *x, short *y, short *z)
+{
+	short rawdata[3], data[3];
+	int i, j;
+	int position = mma_status.position;
+	if (position < 0 || position > 7)
+		position = 0;
+	rawdata[0] = *x;
+	rawdata[1] = *y;
+	rawdata[2] = *z;
+	for (i = 0; i < 3; i++) {
+		data[i] = 0;
+		for (j = 0; j < 3; j++)
+			data[i] += rawdata[j] * ACCHAL[position][i][j];
+	}
+	*x = data[0];
+	*y = data[1];
+	*z = data[2];
+	return 0;
+}
+
+static int mma8451_change_mode(struct i2c_client *client, int mode)
+{
+	int result;
+
+	mma_status.ctl_reg1 = 0;
+	result = i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1, 0);
+	if (result < 0)
+		goto out;
+	mma_status.active = MMA_STANDBY;
+
+	result = i2c_smbus_write_byte_data(client, MMA8451_XYZ_DATA_CFG,
+					   mode);
+	if (result < 0)
+		goto out;
+	mdelay(MODE_CHANGE_DELAY_MS);
+	mma_status.mode = mode;
+
+	return 0;
+out:
+	dev_err(&client->dev, "error when init mma8451:(%d)", result);
+	return result;
+}
+
+static int mma8451_read_data(short *x, short *y, short *z)
+{
+	u8 tmp_data[MMA8451_BUF_SIZE];
+	int ret;
+
+	ret = i2c_smbus_read_i2c_block_data(mma8451_i2c_client,
+					    MMA8451_OUT_X_MSB, 7, tmp_data);
+	if (ret < MMA8451_BUF_SIZE) {
+		dev_err(&mma8451_i2c_client->dev, "i2c block read failed\n");
+		return -EIO;
+	}
+
+	*x = ((tmp_data[0] << 8) & 0xff00) | tmp_data[1];
+	*y = ((tmp_data[2] << 8) & 0xff00) | tmp_data[3];
+	*z = ((tmp_data[4] << 8) & 0xff00) | tmp_data[5];
+	return 0;
+}
+
+static void report_abs(void)
+{
+	short x, y, z;
+	int result;
+	int retry = 3;
+
+	mutex_lock(&mma8451_lock);
+	if (mma_status.active == MMA_STANDBY)
+		goto out;
+	/* wait for the data ready */
+	do {
+		result = i2c_smbus_read_byte_data(mma8451_i2c_client,
+						  MMA8451_STATUS);
+		retry--;
+		msleep(1);
+	} while (!(result & MMA8451_STATUS_ZYXDR) && retry > 0);
+	if (retry == 0)
+		goto out;
+	if (mma8451_read_data(&x, &y, &z) != 0)
+		goto out;
+	mma8451_adjust_position(&x, &y, &z);
+	input_report_abs(mma8451_idev->input, ABS_X, x);
+	input_report_abs(mma8451_idev->input, ABS_Y, y);
+	input_report_abs(mma8451_idev->input, ABS_Z, z);
+	input_sync(mma8451_idev->input);
+out:
+	mutex_unlock(&mma8451_lock);
+}
+
+static void mma8451_dev_poll(struct input_polled_dev *dev)
+{
+	report_abs();
+}
+
+static ssize_t mma8451_enable_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client;
+	u8 val;
+	int enable;
+
+	mutex_lock(&mma8451_lock);
+	client = mma8451_i2c_client;
+	val = i2c_smbus_read_byte_data(client, MMA8451_CTRL_REG1);
+	if ((val & 0x01) && mma_status.active == MMA_ACTIVED)
+		enable = 1;
+	else
+		enable = 0;
+	mutex_unlock(&mma8451_lock);
+	return sprintf(buf, "%d\n", enable);
+}
+
+static ssize_t mma8451_enable_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	struct i2c_client *client;
+	int ret;
+	unsigned long enable;
+	u8 val = 0;
+
+	ret = kstrtoul(buf, 10, &enable);
+	if (ret) {
+		dev_err(dev, "string transform error\n");
+		return ret;
+	}
+
+	mutex_lock(&mma8451_lock);
+	client = mma8451_i2c_client;
+	enable = (enable > 0) ? 1 : 0;
+	if (enable && mma_status.active == MMA_STANDBY) {
+		val = i2c_smbus_read_byte_data(client, MMA8451_CTRL_REG1);
+		ret =
+		    i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+					      val | 0x01);
+		if (!ret)
+			mma_status.active = MMA_ACTIVED;
+
+	} else if (enable == 0 && mma_status.active == MMA_ACTIVED) {
+		val = i2c_smbus_read_byte_data(client, MMA8451_CTRL_REG1);
+		ret =
+		    i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+					      val & 0xFE);
+		if (!ret)
+			mma_status.active = MMA_STANDBY;
+
+	}
+	mutex_unlock(&mma8451_lock);
+	return count;
+}
+
+static ssize_t mma8451_position_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	int position = 0;
+	mutex_lock(&mma8451_lock);
+	position = mma_status.position;
+	mutex_unlock(&mma8451_lock);
+	return sprintf(buf, "%d\n", position);
+}
+
+static ssize_t mma8451_position_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t count)
+{
+	unsigned long  position;
+	int ret;
+	ret = kstrtoul(buf, 10, &position);
+	if (ret) {
+		dev_err(dev, "string transform error\n");
+		return ret;
+	}
+
+	mutex_lock(&mma8451_lock);
+	mma_status.position = (int)position;
+	mutex_unlock(&mma8451_lock);
+	return count;
+}
+
+static ssize_t mma8451_scalemode_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	int mode = 0;
+	mutex_lock(&mma8451_lock);
+	mode = (int)mma_status.mode;
+	mutex_unlock(&mma8451_lock);
+
+	return sprintf(buf, "%d\n", mode);
+}
+
+static ssize_t mma8451_scalemode_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	unsigned long  mode;
+	int ret, active_save;
+	struct i2c_client *client = mma8451_i2c_client;
+
+	ret = kstrtoul(buf, 10, &mode);
+	if (ret) {
+		dev_err(dev, "string transform error\n");
+		goto out;
+	}
+
+	if (mode > MODE_8G) {
+		dev_warn(dev, "not supported mode\n");
+		ret = count;
+		goto out;
+	}
+
+	mutex_lock(&mma8451_lock);
+	if (mode == mma_status.mode) {
+		ret = count;
+		goto out_unlock;
+	}
+
+	active_save = mma_status.active;
+	ret = mma8451_change_mode(client, mode);
+	if (ret)
+		goto out_unlock;
+
+	if (active_save == MMA_ACTIVED) {
+		ret = i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1, 1);
+
+		if (ret)
+			goto out_unlock;
+		mma_status.active = active_save;
+	}
+
+out_unlock:
+	mutex_unlock(&mma8451_lock);
+out:
+	return ret;
+}
+
+static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO,
+			mma8451_enable_show, mma8451_enable_store);
+static DEVICE_ATTR(position, S_IWUSR | S_IRUGO,
+			mma8451_position_show, mma8451_position_store);
+static DEVICE_ATTR(scalemode, S_IWUSR | S_IRUGO,
+			mma8451_scalemode_show, mma8451_scalemode_store);
+
+static struct attribute *mma8451_attributes[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_position.attr,
+	&dev_attr_scalemode.attr,
+	NULL
+};
+
+static const struct attribute_group mma8451_attr_group = {
+	.attrs = mma8451_attributes,
+};
+
+static int mma8451_probe(struct i2c_client *client,
+				   const struct i2c_device_id *id)
+{
+	int result, client_id;
+	struct input_dev *idev;
+	struct i2c_adapter *adapter;
+	u32 pos;
+	struct device_node *of_node = client->dev.of_node;
+	struct regulator *vdd, *vdd_io;
+
+	mma8451_i2c_client = client;
+
+	vdd = devm_regulator_get(&client->dev, "vdd");
+	if (!IS_ERR(vdd)) {
+		result = regulator_enable(vdd);
+		if (result) {
+			dev_err(&client->dev, "vdd set voltage error\n");
+			return result;
+		}
+	}
+
+	vdd_io = devm_regulator_get(&client->dev, "vddio");
+	if (!IS_ERR(vdd_io)) {
+		result = regulator_enable(vdd_io);
+		if (result) {
+			dev_err(&client->dev, "vddio set voltage error\n");
+			return result;
+		}
+	}
+
+	adapter = to_i2c_adapter(client->dev.parent);
+	result = i2c_check_functionality(adapter,
+					 I2C_FUNC_SMBUS_BYTE |
+					 I2C_FUNC_SMBUS_BYTE_DATA);
+	if (!result)
+		goto err_out;
+
+	client_id = i2c_smbus_read_byte_data(client, MMA8451_WHO_AM_I);
+	if (client_id != MMA8451_ID && client_id != MMA8452_ID
+	    && client_id != MMA8453_ID) {
+		dev_err(&client->dev,
+			"read chip ID 0x%x is not equal to 0x%x or 0x%x!\n",
+			result, MMA8451_ID, MMA8452_ID);
+		result = -EINVAL;
+		goto err_out;
+	}
+
+	/* Initialize the MMA8451 chip */
+	result = mma8451_change_mode(client, senstive_mode);
+	if (result) {
+		dev_err(&client->dev,
+			"error when init mma8451 chip:(%d)\n", result);
+		goto err_out;
+	}
+
+	hwmon_dev = hwmon_device_register(&client->dev);
+	if (!hwmon_dev) {
+		result = -ENOMEM;
+		dev_err(&client->dev, "error when register hwmon device\n");
+		goto err_out;
+	}
+
+	mma8451_idev = input_allocate_polled_device();
+	if (!mma8451_idev) {
+		result = -ENOMEM;
+		dev_err(&client->dev, "alloc poll device failed!\n");
+		goto err_alloc_poll_device;
+	}
+	mma8451_idev->poll = mma8451_dev_poll;
+	mma8451_idev->poll_interval = POLL_INTERVAL;
+	mma8451_idev->poll_interval_min = POLL_INTERVAL_MIN;
+	mma8451_idev->poll_interval_max = POLL_INTERVAL_MAX;
+	idev = mma8451_idev->input;
+	idev->name = "mma845x";
+	idev->id.bustype = BUS_I2C;
+	idev->evbit[0] = BIT_MASK(EV_ABS);
+
+	input_set_abs_params(idev, ABS_X, -8192, 8191, INPUT_FUZZ, INPUT_FLAT);
+	input_set_abs_params(idev, ABS_Y, -8192, 8191, INPUT_FUZZ, INPUT_FLAT);
+	input_set_abs_params(idev, ABS_Z, -8192, 8191, INPUT_FUZZ, INPUT_FLAT);
+
+	result = input_register_polled_device(mma8451_idev);
+	if (result) {
+		dev_err(&client->dev, "register poll device failed!\n");
+		goto err_register_polled_device;
+	}
+	result = sysfs_create_group(&idev->dev.kobj, &mma8451_attr_group);
+	if (result) {
+		dev_err(&client->dev, "create device file failed!\n");
+		result = -EINVAL;
+		goto err_register_polled_device;
+	}
+
+	result = of_property_read_u32(of_node, "position", &pos);
+	if (result)
+		pos = DEFAULT_POSITION;
+	mma_status.position = (int)pos;
+
+	return 0;
+err_register_polled_device:
+	input_free_polled_device(mma8451_idev);
+err_alloc_poll_device:
+	hwmon_device_unregister(&client->dev);
+err_out:
+	return result;
+}
+
+static int mma8451_stop_chip(struct i2c_client *client)
+{
+	int ret = 0;
+	if (mma_status.active == MMA_ACTIVED) {
+		mma_status.ctl_reg1 = i2c_smbus_read_byte_data(client,
+							       MMA8451_CTRL_REG1);
+		ret = i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+						mma_status.ctl_reg1 & 0xFE);
+	}
+	return ret;
+}
+
+static int mma8451_remove(struct i2c_client *client)
+{
+	int ret;
+	ret = mma8451_stop_chip(client);
+	hwmon_device_unregister(hwmon_dev);
+
+	return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mma8451_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return mma8451_stop_chip(client);
+}
+
+static int mma8451_resume(struct device *dev)
+{
+	int ret = 0;
+	struct i2c_client *client = to_i2c_client(dev);
+	if (mma_status.active == MMA_ACTIVED)
+		ret = i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+						mma_status.ctl_reg1);
+	return ret;
+
+}
+#endif
+
+static const struct i2c_device_id mma8451_id[] = {
+	{"mma8451", 0},
+};
+
+MODULE_DEVICE_TABLE(i2c, mma8451_id);
+
+static SIMPLE_DEV_PM_OPS(mma8451_pm_ops, mma8451_suspend, mma8451_resume);
+static struct i2c_driver mma8451_driver = {
+	.driver = {
+		   .name = "mma8451",
+		   .owner = THIS_MODULE,
+		   .pm = &mma8451_pm_ops,
+		   },
+	.probe = mma8451_probe,
+	.remove = mma8451_remove,
+	.id_table = mma8451_id,
+};
+
+static int __init mma8451_init(void)
+{
+	/* register driver */
+	int res;
+
+	res = i2c_add_driver(&mma8451_driver);
+	if (res < 0) {
+		printk(KERN_INFO "add mma8451 i2c driver failed\n");
+		return -ENODEV;
+	}
+	return res;
+}
+
+static void __exit mma8451_exit(void)
+{
+	i2c_del_driver(&mma8451_driver);
+}
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MMA8451 3-Axis Orientation/Motion Detection Sensor driver");
+MODULE_LICENSE("GPL");
+
+module_init(mma8451_init);
+module_exit(mma8451_exit);