ENGR00137485-1 MMA8451: Add mma8451 accelerometer driver

Add mma8451 accelerometer driver.

Signed-off-by: Xinyu Chen <xinyu.chen@freescale.com>
Signed-off-by: Sammy He <r62914@freescale.com>

3 files changed, 377 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 5f888f7e7dcb..aa034a13d830 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1385,4 +1385,9 @@ config SENSORS_ATK0110
 
 endif # ACPI
 
+config MXC_MMA8451
+	tristate "MMA8451 device driver"
+	depends on I2C
+	default y
+
 endif # HWMON
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 28061cfa0cdb..0a9ac035f5cf 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -118,6 +118,7 @@ obj-$(CONFIG_SENSORS_W83L785TS)	+= w83l785ts.o
 obj-$(CONFIG_SENSORS_W83L786NG)	+= w83l786ng.o
 obj-$(CONFIG_SENSORS_WM831X)	+= wm831x-hwmon.o
 obj-$(CONFIG_SENSORS_WM8350)	+= wm8350-hwmon.o
+obj-$(CONFIG_MXC_MMA8451)       += mxc_mma8451.o
 
 # PMBus drivers
 obj-$(CONFIG_PMBUS)		+= pmbus_core.o
diff --git a/drivers/hwmon/mxc_mma8451.c b/drivers/hwmon/mxc_mma8451.c
new file mode 100644
index 000000000000..901be5cedb37
--- /dev/null
+++ b/drivers/hwmon/mxc_mma8451.c
@@ -0,0 +1,371 @@
+/*
+ *  mma8451.c - Linux kernel modules for 3-Axis Orientation/Motion
+ *  Detection Sensor
+ *
+ *  Copyright (C) 2010 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/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>
+
+/*
+ * Defines
+ */
+#define assert(expr)\
+	if (!(expr)) {\
+		printk(KERN_ERR "Assertion failed! %s,%d,%s,%s\n",\
+			__FILE__, __LINE__, __func__, #expr);\
+	}
+
+#define MMA8451_DRV_NAME	"mma8451"
+#define MMA8451_I2C_ADDR	0x1C
+#define MMA8451_ID		0x1A
+
+#define POLL_INTERVAL		100
+#define INPUT_FUZZ		32
+#define INPUT_FLAT		32
+#define MODE_CHANGE_DELAY_MS	100
+
+/* 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,
+};
+
+enum {
+	MODE_2G = 0,
+	MODE_4G,
+	MODE_8G,
+};
+
+/* mma8451 status */
+struct mma8451_status {
+	u8 mode;
+	u8 ctl_reg1;
+};
+
+static struct mma8451_status mma_status = {
+	.mode = 0,
+	.ctl_reg1 = 0
+};
+
+static struct input_polled_dev *mma8451_idev;
+static struct device *hwmon_dev;
+static int test_test_mode = 1;
+static struct i2c_client *mma8451_i2c_client;
+
+/***************************************************************
+ *
+ * Initialization function
+ *
+ **************************************************************/
+static int mma8451_init_client(struct i2c_client *client)
+{
+	int result;
+
+	mma_status.ctl_reg1 = 0x00;
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+				      mma_status.ctl_reg1);
+	assert(result == 0);
+
+	mma_status.mode = MODE_2G;
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8451_XYZ_DATA_CFG,
+				      mma_status.mode);
+	assert(result == 0);
+
+	mma_status.ctl_reg1 |= 0x01;
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+				      mma_status.ctl_reg1);
+	assert(result == 0);
+
+	mdelay(MODE_CHANGE_DELAY_MS);
+
+	return result;
+}
+
+/***************************************************************
+*
+* read sensor data from mma8451
+*
+***************************************************************/
+static int mma8451_read_data(short *x, short *y, short *z)
+{
+	u8 tmp_data[7];
+
+	if (i2c_smbus_read_i2c_block_data
+	    (mma8451_i2c_client, MMA8451_OUT_X_MSB, 7, tmp_data) < 7) {
+		dev_err(&mma8451_i2c_client->dev, "i2c block read failed\n");
+		return -3;
+	}
+
+	*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];
+
+	*x = (short)(*x) >> 2;
+	*y = (short)(*y) >> 2;
+	*z = (short)(*z) >> 2;
+
+	if (mma_status.mode == MODE_4G) {
+		(*x) = (*x) << 1;
+		(*y) = (*y) << 1;
+		(*z) = (*z) << 1;
+	} else if (mma_status.mode == MODE_8G) {
+		(*x) = (*x) << 2;
+		(*y) = (*y) << 2;
+		(*z) = (*z) << 2;
+	}
+
+	return 0;
+}
+
+static void report_abs(void)
+{
+	short x, y, z;
+	int result;
+
+	do {
+		result =
+		    i2c_smbus_read_byte_data(mma8451_i2c_client,
+					     MMA8451_STATUS);
+	} while (!(result & 0x08));	/* wait for new data */
+
+	if (mma8451_read_data(&x, &y, &z) != 0)
+		return;
+
+	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);
+}
+
+static void mma8451_dev_poll(struct input_polled_dev *dev)
+{
+	report_abs();
+}
+
+static int __devinit mma8451_probe(struct i2c_client *client,
+				   const struct i2c_device_id *id)
+{
+	int result;
+	mma8451_i2c_client = client;
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+
+	struct input_dev *idev;
+
+	result = i2c_check_functionality(adapter,
+					 I2C_FUNC_SMBUS_BYTE |
+					 I2C_FUNC_SMBUS_BYTE_DATA);
+	assert(result);
+
+	printk(KERN_INFO "check mma8451 chip ID\n");
+	result = i2c_smbus_read_byte_data(client, MMA8451_WHO_AM_I);
+
+	if (MMA8451_ID != result) {
+		dev_err(&client->dev,
+			"read chip ID 0x%x is not equal to 0x%x!\n", result,
+			MMA8451_ID);
+		printk(KERN_INFO "read chip ID failed\n");
+		result = -EINVAL;
+		goto err_detach_client;
+	}
+
+	/* Initialize the MMA8451 chip */
+	result = mma8451_init_client(client);
+	assert(result == 0);
+
+	hwmon_dev = hwmon_device_register(&client->dev);
+	assert(!(IS_ERR(hwmon_dev)));
+
+	dev_info(&client->dev, "build time %s %s\n", __DATE__, __TIME__);
+
+	/*input poll device register */
+	mma8451_idev = input_allocate_polled_device();
+	if (!mma8451_idev) {
+		dev_err(&client->dev, "alloc poll device failed!\n");
+		result = -ENOMEM;
+		return result;
+	}
+	mma8451_idev->poll = mma8451_dev_poll;
+	mma8451_idev->poll_interval = POLL_INTERVAL;
+	idev = mma8451_idev->input;
+	idev->name = MMA8451_DRV_NAME;
+	idev->id.bustype = BUS_I2C;
+	idev->dev.parent = &client->dev;
+	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");
+		return result;
+	}
+	return result;
+
+err_detach_client:
+	return result;
+}
+
+static int __devexit mma8451_remove(struct i2c_client *client)
+{
+	int result;
+	mma_status.ctl_reg1 =
+	    i2c_smbus_read_byte_data(client, MMA8451_CTRL_REG1);
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+				      mma_status.ctl_reg1 & 0xFE);
+	assert(result == 0);
+
+	hwmon_device_unregister(hwmon_dev);
+
+	return result;
+}
+
+static int mma8451_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	int result;
+	mma_status.ctl_reg1 =
+	    i2c_smbus_read_byte_data(client, MMA8451_CTRL_REG1);
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+				      mma_status.ctl_reg1 & 0xFE);
+	assert(result == 0);
+	return result;
+}
+
+static int mma8451_resume(struct i2c_client *client)
+{
+	int result;
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8451_CTRL_REG1,
+				      mma_status.ctl_reg1);
+	assert(result == 0);
+	return result;
+}
+
+static const struct i2c_device_id mma8451_id[] = {
+	{MMA8451_DRV_NAME, 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(i2c, mma8451_id);
+
+static struct i2c_driver mma8451_driver = {
+	.driver = {
+		   .name = MMA8451_DRV_NAME,
+		   .owner = THIS_MODULE,
+		   },
+	.suspend = mma8451_suspend,
+	.resume = mma8451_resume,
+	.probe = mma8451_probe,
+	.remove = __devexit_p(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;
+	}
+	printk(KERN_INFO "add mma8451 i2c driver\n");
+
+	return res;
+}
+
+static void __exit mma8451_exit(void)
+{
+	printk(KERN_INFO "remove mma8451 i2c driver.\n");
+	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);