ENGR00137546-1 MMA8450: Add mma8450 accelerometer driver

Add mma8450 accelerometer driver.

Signed-off-by: Sammy He <r62914@freescale.com>

3 files changed, 396 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index aa034a13d830..01f90bbfe640 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1385,6 +1385,11 @@ config SENSORS_ATK0110
 
 endif # ACPI
 
+config MXC_MMA8450
+	tristate "MMA8450 device driver"
+	depends on I2C
+	default y
+
 config MXC_MMA8451
 	tristate "MMA8451 device driver"
 	depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 0a9ac035f5cf..b1da8bc1fa6d 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-$(CONFIG_MXC_MMA8450)       += mxc_mma8450.o
 obj-$(CONFIG_MXC_MMA8451)       += mxc_mma8451.o
 
 # PMBus drivers
diff --git a/drivers/hwmon/mxc_mma8450.c b/drivers/hwmon/mxc_mma8450.c
new file mode 100644
index 000000000000..3d4c1ef1f4d9
--- /dev/null
+++ b/drivers/hwmon/mxc_mma8450.c
@@ -0,0 +1,390 @@
+/*
+ *  mma8450.c - Linux kernel modules for 3-Axis Orientation/Motion
+ *  Detection Sensor
+ *
+ *  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/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 MMA8450_DRV_NAME	"mma8450"
+#define MMA8450_I2C_ADDR	0x1C
+#define MMA8450_ID		0xC6
+#define MMA8450_STATUS 0x00
+#define MODE_CHANGE_DELAY_MS 100
+#define POLL_INTERVAL		100
+#define INPUT_FUZZ	32
+#define INPUT_FLAT	32
+
+/* register enum for mma8450 registers */
+enum {
+	MMA8450_STATUS1 = 0x00,
+	MMA8450_OUT_X8,
+	MMA8450_OUT_Y8,
+	MMA8450_OUT_Z8,
+
+	MMA8450_STATUS2,
+	MMA8450_OUT_X_LSB,
+	MMA8450_OUT_X_MSB,
+	MMA8450_OUT_Y_LSB,
+	MMA8450_OUT_Y_MSB,
+	MMA8450_OUT_Z_LSB,
+	MMA8450_OUT_Z_MSB,
+
+	MMA8450_STATUS3,
+	MMA8450_OUT_X_DELTA,
+	MMA8450_OUT_Y_DELTA,
+	MMA8450_OUT_Z_DELTA,
+
+	MMA8450_WHO_AM_I,
+
+	MMA8450_F_STATUS,
+	MMA8450_F_8DATA,
+	MMA8450_F_12DATA,
+	MMA8450_F_SETUP,
+
+	MMA8450_SYSMOD,
+	MMA8450_INT_SOURCE,
+	MMA8450_XYZ_DATA_CFG,
+	MMA8450_HP_FILTER_CUTOFF,
+
+	MMA8450_PL_STATUS,
+	MMA8450_PL_PRE_STATUS,
+	MMA8450_PL_CFG,
+	MMA8450_PL_COUNT,
+	MMA8450_PL_BF_ZCOMP,
+	MMA8450_PL_P_L_THS_REG1,
+	MMA8450_PL_P_L_THS_REG2,
+	MMA8450_PL_P_L_THS_REG3,
+	MMA8450_PL_L_P_THS_REG1,
+	MMA8450_PL_L_P_THS_REG2,
+	MMA8450_PL_L_P_THS_REG3,
+
+	MMA8450_FF_MT_CFG_1,
+	MMA8450_FF_MT_SRC_1,
+	MMA8450_FF_MT_THS_1,
+	MMA8450_FF_MT_COUNT_1,
+	MMA8450_FF_MT_CFG_2,
+	MMA8450_FF_MT_SRC_2,
+	MMA8450_FF_MT_THS_2,
+	MMA8450_FF_MT_COUNT_2,
+
+	MMA8450_TRANSIENT_CFG,
+	MMA8450_TRANSIENT_SRC,
+	MMA8450_TRANSIENT_THS,
+	MMA8450_TRANSIENT_COUNT,
+
+	MMA8450_PULSE_CFG,
+	MMA8450_PULSE_SRC,
+	MMA8450_PULSE_THSX,
+	MMA8450_PULSE_THSY,
+	MMA8450_PULSE_THSZ,
+	MMA8450_PULSE_TMLT,
+	MMA8450_PULSE_LTCY,
+	MMA8450_PULSE_WIND,
+
+	MMA8450_ASLP_COUNT,
+	MMA8450_CTRL_REG1,
+	MMA8450_CTRL_REG2,
+	MMA8450_CTRL_REG3,
+	MMA8450_CTRL_REG4,
+	MMA8450_CTRL_REG5,
+
+	MMA8450_OFF_X,
+	MMA8450_OFF_Y,
+	MMA8450_OFF_Z,
+
+	MMA8450_REG_END,
+};
+
+enum {
+	MODE_STANDBY,
+	MODE_2G,
+	MODE_4G,
+	MODE_8G,
+};
+
+/* mma8450 status */
+struct mma8450_status {
+	u8 mode;
+	u8 ctl_reg2;
+	u8 ctl_reg1;
+};
+
+static struct mma8450_status mma_status = {
+	.mode = 0,
+	.ctl_reg2 = 0,
+	.ctl_reg1 = 0
+};
+
+static struct device *hwmon_dev;
+static struct i2c_client *mma8450_i2c_client;
+static struct input_polled_dev *mma8450_idev;
+
+/*
+ * Initialization function
+ */
+static int mma8450_init_client(struct i2c_client *client)
+{
+	int result;
+
+	mma_status.mode = MODE_2G;
+
+	result = i2c_smbus_write_byte_data(client, MMA8450_XYZ_DATA_CFG, 0x07);
+	assert(result == 0);
+
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8450_CTRL_REG1,
+				      mma_status.mode);
+	assert(result == 0);
+
+	mdelay(MODE_CHANGE_DELAY_MS);
+
+	return result;
+}
+
+/*
+ * read sensor data from mma8450
+ */
+static int mma8450_read_data(short *x, short *y, short *z)
+{
+	u8 tmp_data[7];
+
+	if (i2c_smbus_read_i2c_block_data
+	    (mma8450_i2c_client, MMA8450_OUT_X_LSB, 7, tmp_data) < 7) {
+		dev_err(&mma8450_i2c_client->dev, "i2c block read failed\n");
+		return -3;
+	}
+
+	*x = ((tmp_data[1] << 8) & 0xff00) | ((tmp_data[0] << 4) & 0x00f0);
+	*y = ((tmp_data[3] << 8) & 0xff00) | ((tmp_data[2] << 4) & 0x00f0);
+	*z = ((tmp_data[5] << 8) & 0xff00) | ((tmp_data[4] << 4) & 0x00f0);
+
+	*x = (short)(*x) >> 4;
+	*y = (short)(*y) >> 4;
+	*z = (short)(*z) >> 4;
+
+	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(mma8450_i2c_client,
+					     MMA8450_STATUS3);
+	} while (!(result & 0x08));	/* wait for new data */
+
+	if (mma8450_read_data(&x, &y, &z) != 0)
+		return;
+
+	input_report_abs(mma8450_idev->input, ABS_X, x);
+	input_report_abs(mma8450_idev->input, ABS_Y, y);
+	input_report_abs(mma8450_idev->input, ABS_Z, z);
+	input_sync(mma8450_idev->input);
+}
+
+static void mma8450_dev_poll(struct input_polled_dev *dev)
+{
+	report_abs();
+}
+
+/*
+ * I2C init/probing/exit functions
+ */
+static int __devinit mma8450_probe(struct i2c_client *client,
+				   const struct i2c_device_id *id)
+{
+	int result;
+	struct i2c_adapter *adapter;
+	struct input_dev *idev;
+
+	mma8450_i2c_client = client;
+	adapter = to_i2c_adapter(client->dev.parent);
+
+	result = i2c_check_functionality(adapter,
+					 I2C_FUNC_SMBUS_BYTE |
+					 I2C_FUNC_SMBUS_BYTE_DATA);
+	assert(result);
+
+	printk(KERN_INFO "check mma8450 chip ID\n");
+	result = i2c_smbus_read_byte_data(client, MMA8450_WHO_AM_I);
+
+	if (MMA8450_ID != (result)) {
+		dev_err(&client->dev,
+			"read chip ID 0x%x is not equal to 0x%x!\n", result,
+			MMA8450_ID);
+		printk(KERN_INFO "read chip ID failed\n");
+		result = -EINVAL;
+		goto err_detach_client;
+	}
+
+	/* Initialize the MMA8450 chip */
+	result = mma8450_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 */
+	mma8450_idev = input_allocate_polled_device();
+	if (!mma8450_idev) {
+		dev_err(&client->dev, "alloc poll device failed!\n");
+		result = -ENOMEM;
+		return result;
+	}
+	mma8450_idev->poll = mma8450_dev_poll;
+	mma8450_idev->poll_interval = POLL_INTERVAL;
+	idev = mma8450_idev->input;
+	idev->name = MMA8450_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(mma8450_idev);
+	if (result) {
+		dev_err(&client->dev, "register poll device failed!\n");
+		return result;
+	}
+
+	return result;
+
+err_detach_client:
+	return result;
+}
+
+static int __devexit mma8450_remove(struct i2c_client *client)
+{
+	int result;
+	mma_status.ctl_reg1 =
+	    i2c_smbus_read_byte_data(client, MMA8450_CTRL_REG1);
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8450_CTRL_REG1,
+				      mma_status.ctl_reg1 & 0xFC);
+	assert(result == 0);
+
+	hwmon_device_unregister(hwmon_dev);
+
+	return result;
+}
+
+static int mma8450_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	int result;
+	mma_status.ctl_reg1 =
+	    i2c_smbus_read_byte_data(client, MMA8450_CTRL_REG1);
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8450_CTRL_REG1,
+				      mma_status.ctl_reg1 & 0xFC);
+	assert(result == 0);
+	return result;
+}
+
+static int mma8450_resume(struct i2c_client *client)
+{
+	int result;
+	result =
+	    i2c_smbus_write_byte_data(client, MMA8450_CTRL_REG1,
+				      mma_status.mode);
+	assert(result == 0);
+	return result;
+}
+
+static const struct i2c_device_id mma8450_id[] = {
+	{MMA8450_DRV_NAME, 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(i2c, mma8450_id);
+
+static struct i2c_driver mma8450_driver = {
+	.driver = {
+		   .name = MMA8450_DRV_NAME,
+		   .owner = THIS_MODULE,
+		   },
+	.suspend = mma8450_suspend,
+	.resume = mma8450_resume,
+	.probe = mma8450_probe,
+	.remove = __devexit_p(mma8450_remove),
+	.id_table = mma8450_id,
+};
+
+static int __init mma8450_init(void)
+{
+	/* register driver */
+	int res;
+
+	res = i2c_add_driver(&mma8450_driver);
+	if (res < 0) {
+		printk(KERN_INFO "add mma8450 i2c driver failed\n");
+		return -ENODEV;
+	}
+	printk(KERN_INFO "add mma8450 i2c driver\n");
+
+	return res;
+}
+
+static void __exit mma8450_exit(void)
+{
+	printk(KERN_INFO "remove mma8450 i2c driver.\n");
+	i2c_del_driver(&mma8450_driver);
+}
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MMA8450 3-Axis Orientation/Motion Detection Sensor driver");
+MODULE_LICENSE("GPL");
+
+module_init(mma8450_init);
+module_exit(mma8450_exit);