[PATCH] input: Add support for MMA7455L/MMA7456L 3-Axis Accelerometer

[Alexander Shiyan <shc_work@mail.ru>]

This patch adds support for Freescale MMA7455L/MMA7456L 3-Axis
Accelerometer connected to I2C bus. Driver can be loaded ether
with or without DT support. The basic parameters of the driver
can be changed through sysfs.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
---
 .../devicetree/bindings/input/fsl-mma745xl.txt     |  16 +
 drivers/input/misc/Kconfig                         |   8 +
 drivers/input/misc/Makefile                        |   1 +
 drivers/input/misc/mma745xl.c                      | 490 +++++++++++++++++++++
 4 files changed, 515 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/fsl-mma745xl.txt
 create mode 100644 drivers/input/misc/mma745xl.c

diff --git a/Documentation/devicetree/bindings/input/fsl-mma745xl.txt b/Documentation/devicetree/bindings/input/fsl-mma745xl.txt
new file mode 100644
index 0000000..68feeb7
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/fsl-mma745xl.txt
@@ -0,0 +1,16 @@
+* Freescale MMA7455L/MMA7456L Three Axis Accelerometer
+
+Required properties:
+- compatible: Should contain "fsl,mma7455l".
+- reg: The I2C address of device.
+- interrupt-parent: Defines the parent interrupt controller.
+- interrupts: Should contain the IRQ specifiers for INT1 and INT2 pins.
+
+Example:
+	accelerometer: mma7455l@1d {
+		compatible = "fsl,mma7455l";
+		reg = <0x1d>;
+		interrupt-parent = <&gpio1>;
+		interrupts = <7 GPIO_ACTIVE_HIGH>,
+			     <6 GPIO_ACTIVE_HIGH>;
+	};
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 5f4967d..ecd3a50 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -176,6 +176,14 @@ config INPUT_MC13783_PWRBUTTON
 	  To compile this driver as a module, choose M here: the module
 	  will be called mc13783-pwrbutton.
 
+config INPUT_MMA745XL
+	tristate "MMA745xL - Freescale's 3-Axis, Digital Acceleration Sensor"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say Y here if you want to support Freescale's MMA7455L/MMA7456L
+	  Three Axis Accelerometer through I2C interface.
+
 config INPUT_MMA8450
 	tristate "MMA8450 - Freescale's 3-Axis, 8/12-bit Digital Accelerometer"
 	depends on I2C
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 0ebfb6d..10b2c12 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_INPUT_M68K_BEEP)		+= m68kspkr.o
 obj-$(CONFIG_INPUT_MAX8925_ONKEY)	+= max8925_onkey.o
 obj-$(CONFIG_INPUT_MAX8997_HAPTIC)	+= max8997_haptic.o
 obj-$(CONFIG_INPUT_MC13783_PWRBUTTON)	+= mc13783-pwrbutton.o
+obj-$(CONFIG_INPUT_MMA745XL)		+= mma745xl.o
 obj-$(CONFIG_INPUT_MMA8450)		+= mma8450.o
 obj-$(CONFIG_INPUT_MPU3050)		+= mpu3050.o
 obj-$(CONFIG_INPUT_PCAP)		+= pcap_keys.o
diff --git a/drivers/input/misc/mma745xl.c b/drivers/input/misc/mma745xl.c
new file mode 100644
index 0000000..4e4e847
--- /dev/null
+++ b/drivers/input/misc/mma745xl.c
@@ -0,0 +1,490 @@
+/*
+ *  Driver for Freescale's 3-Axis Acceleration Sensor MMA7455L/MMA7456L
+ *
+ *  Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
+ *
+ *  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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/regmap.h>
+#include <linux/sysfs.h>
+
+#define MMA745XL_REG_XOUTL	0x00
+#define MMA745XL_REG_XOUTH	0x01
+#define MMA745XL_REG_YOUTL	0x02
+#define MMA745XL_REG_YOUTH	0x03
+#define MMA745XL_REG_ZOUTL	0x04
+#define MMA745XL_REG_ZOUTH	0x05
+#define MMA745XL_REG_XOUT8	0x06
+#define MMA745XL_REG_YOUT8	0x07
+#define MMA745XL_REG_ZOUT8	0x08
+#define MMA745XL_REG_STATUS	0x09
+# define STATUS_DRDY		(1 << 0)
+# define STATUS_DOVR		(1 << 1)
+# define STATUS_PERR		(1 << 2)
+#define MMA745XL_REG_DETSRC	0x0a
+# define DETSRC_PDZ		(1 << 2)
+# define DETSRC_PDY		(1 << 3)
+# define DETSRC_PDX		(1 << 4)
+# define DETSRC_LDZ		(1 << 5)
+# define DETSRC_LDY		(1 << 6)
+# define DETSRC_LDX		(1 << 7)
+#define MMA745XL_REG_TOUT	0x0b
+#define MMA745XL_REG_I2CAD	0x0d
+#define MMA745XL_REG_USRINF	0x0e
+#define MMA745XL_REG_WHOAMI	0x0f
+# define WHOAMI_MMA745XL	0x55
+#define MMA745XL_REG_XOFFL	0x10
+#define MMA745XL_REG_XOFFH	0x11
+#define MMA745XL_REG_YOFFL	0x12
+#define MMA745XL_REG_YOFFH	0x13
+#define MMA745XL_REG_ZOFFL	0x14
+#define MMA745XL_REG_ZOFFH	0x15
+#define MMA745XL_REG_MCTL	0x16
+# define MCTL_MODE_STANDBY	(0 << 0)
+# define MCTL_MODE_MEASUREMENT	(1 << 0)
+# define MCTL_MODE_LEVELDET	(2 << 0)
+# define MCTL_MODE_PULSEDET	(3 << 0)
+# define MCTL_MODE_MASK		(3 << 0)
+# define MCTL_GLVL_8		(0 << 2)
+# define MCTL_GLVL_2		(1 << 2)
+# define MCTL_GLVL_4		(2 << 2)
+# define MCTL_GLVL_MASK		(3 << 2)
+# define MCTL_STON		(1 << 4)
+# define MCTL_SPI3W		(1 << 5)
+# define MCTL_DRPD		(1 << 6)
+#define MMA745XL_REG_INTRST	0x17
+# define INTRST_CLR_INT1	(1 << 0)
+# define INTRST_CLR_INT2	(1 << 1)
+#define MMA745XL_REG_CTL1	0x18
+# define CTL1_DFBW		(1 << 7)
+#define MMA745XL_REG_CTL2	0x19
+#define MMA745XL_REG_LDTH	0x1a
+#define MMA745XL_REG_PDTH	0x1b
+#define MMA745XL_REG_PW		0x1c
+#define MMA745XL_REG_LT		0x1d
+#define MMA745XL_REG_TW		0x1e
+
+#define MMA745XL_MODE_DEF	MCTL_MODE_LEVELDET
+#define MMA745XL_MEASURE_TIME	20
+#define MMA745XL_THRESHOLD_DEF	24
+#define MMA745XL_PULSEW_DEF	6
+
+#define MMA745XL_X		(1 << 0)
+#define MMA745XL_Y		(1 << 1)
+#define MMA745XL_Z		(1 << 2)
+
+struct mma745xl {
+	struct regmap		*regmap;
+	struct regmap_config	regcfg;
+	unsigned int		mode;
+};
+
+static int mma745xl_measure_axis(struct mma745xl *priv, unsigned int reg,
+				 int *val)
+{
+	unsigned int tmpl = 0, tmph = 0;
+	int ret;
+
+	ret = regmap_read(priv->regmap, reg, &tmpl);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(priv->regmap, reg + 1, &tmph);
+	if (!ret) {
+		*val = ((tmph & 0x03) << 8) | (tmpl & 0xff);
+		/* Make signed variable */
+		if (*val & 0x200)
+			*val -= 0x400;
+	}
+
+	return ret;
+}
+
+static void mma745xl_measure(struct input_dev *input, unsigned int mask)
+{
+	struct mma745xl *priv = input_get_drvdata(input);
+	int x, y, z;
+
+	if (mask & MMA745XL_X)
+		if (!mma745xl_measure_axis(priv, MMA745XL_REG_XOUTL, &x))
+			input_report_abs(input, ABS_X, x);
+	if (mask & MMA745XL_Y)
+		if (!mma745xl_measure_axis(priv, MMA745XL_REG_YOUTL, &y))
+			input_report_abs(input, ABS_Y, y);
+	if (mask & MMA745XL_Z)
+		if (!mma745xl_measure_axis(priv, MMA745XL_REG_ZOUTL, &z))
+			input_report_abs(input, ABS_Z, z);
+
+	input_sync(input);
+}
+
+static irqreturn_t mma745xl_interrupt(int irq, void *dev_id)
+{
+	struct input_dev *input = dev_id;
+	struct mma745xl *priv = input_get_drvdata(input);
+	unsigned int val;
+
+	if (!regmap_read(priv->regmap, MMA745XL_REG_DETSRC, &val)) {
+		unsigned int mask;
+
+		mask = (val & (DETSRC_LDX | DETSRC_PDX)) ? MMA745XL_X : 0;
+		mask |= (val & (DETSRC_LDY | DETSRC_PDY)) ? MMA745XL_Y : 0;
+		mask |= (val & (DETSRC_LDZ | DETSRC_PDZ)) ? MMA745XL_Z : 0;
+		mma745xl_measure(input, mask);
+	}
+
+	/* Clear interrupt flags */
+	regmap_write(priv->regmap, MMA745XL_REG_INTRST,
+		     INTRST_CLR_INT1 | INTRST_CLR_INT2);
+	/* Enable pins to trigger */
+	regmap_write(priv->regmap, MMA745XL_REG_INTRST, 0);
+
+	return IRQ_HANDLED;
+}
+
+static int mma745xl_open(struct input_dev *input)
+{
+	struct mma745xl *priv = input_get_drvdata(input);
+	unsigned long tmp;
+	unsigned int val;
+	int ret;
+
+	/* Get initial values */
+	ret = regmap_update_bits(priv->regmap, MMA745XL_REG_MCTL,
+				 MCTL_MODE_MASK, MCTL_MODE_MEASUREMENT);
+	if (ret)
+		return ret;
+
+	tmp = jiffies + msecs_to_jiffies(MMA745XL_MEASURE_TIME);
+	for (;;) {
+		ret = regmap_read(priv->regmap, MMA745XL_REG_STATUS, &val);
+		if (ret)
+			return ret;
+		if (val == STATUS_DRDY)
+			break;
+		if (val & (STATUS_DOVR | STATUS_PERR)) {
+			/* Clear status */
+			ret = regmap_read(priv->regmap,
+					  MMA745XL_REG_XOUTL, &val);
+			if (ret)
+				return ret;
+			/* Restart measuring */
+			tmp = jiffies + msecs_to_jiffies(MMA745XL_MEASURE_TIME);
+		}
+		if (time_after(jiffies, tmp)) {
+			dev_err(&input->dev, "Measure timeout\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	mma745xl_measure(input, MMA745XL_X | MMA745XL_Y | MMA745XL_Z);
+
+	/* Go to desired mode */
+	return regmap_update_bits(priv->regmap, MMA745XL_REG_MCTL,
+				  MCTL_MODE_MASK, priv->mode);
+}
+
+static void mma745xl_close(struct input_dev *input)
+{
+	struct mma745xl *priv = input_get_drvdata(input);
+
+	regmap_update_bits(priv->regmap, MMA745XL_REG_MCTL, MCTL_MODE_MASK, 0);
+}
+
+static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct input_dev *input = dev_get_drvdata(dev);
+	struct mma745xl *priv = input_get_drvdata(input);
+
+	switch (priv->mode) {
+	case MCTL_MODE_LEVELDET:
+		return sprintf(buf, "level\n");
+	case MCTL_MODE_PULSEDET:
+		return sprintf(buf, "pulse\n");
+	default:
+		break;
+	}
+
+	return sprintf(buf, "unknown\n");
+}
+
+static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct input_dev *input = dev_get_drvdata(dev);
+	struct mma745xl *priv = input_get_drvdata(input);
+
+	if (!strncmp(buf, "level", count))
+		priv->mode = MCTL_MODE_LEVELDET;
+	else if (!strncmp(buf, "pulse", count))
+		priv->mode = MCTL_MODE_PULSEDET;
+	else
+		return -EINVAL;
+
+	return count;
+}
+
+static ssize_t level_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct input_dev *input = dev_get_drvdata(dev);
+	struct mma745xl *priv = input_get_drvdata(input);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(priv->regmap, MMA745XL_REG_MCTL, &val);
+	if (ret)
+		return ret;
+
+	switch (val & MCTL_GLVL_MASK) {
+	case MCTL_GLVL_2:
+		return sprintf(buf, "2\n");
+	case MCTL_GLVL_4:
+		return sprintf(buf, "4\n");
+	case MCTL_GLVL_8:
+		return sprintf(buf, "8\n");
+	default:
+		break;
+	}
+
+	return sprintf(buf, "unknown\n");
+}
+
+static ssize_t level_store(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct input_dev *input = dev_get_drvdata(dev);
+	struct mma745xl *priv = input_get_drvdata(input);
+	unsigned long tmp;
+	unsigned int val;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &tmp);
+	if (ret)
+		return ret;
+
+	switch (tmp) {
+	case 2:
+		val = MCTL_GLVL_2;
+		break;
+	case 4:
+		val = MCTL_GLVL_4;
+		break;
+	case 8:
+		val = MCTL_GLVL_8;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(priv->regmap, MMA745XL_REG_MCTL,
+				 MCTL_GLVL_MASK, val);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static ssize_t threshold_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct input_dev *input = dev_get_drvdata(dev);
+	struct mma745xl *priv = input_get_drvdata(input);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(priv->regmap, MMA745XL_REG_LDTH, &val);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%d\n", val & 0x7f);
+}
+
+static ssize_t threshold_store(struct device *dev,
+			       struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	struct input_dev *input = dev_get_drvdata(dev);
+	struct mma745xl *priv = input_get_drvdata(input);
+	unsigned long tmp;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &tmp);
+	if (ret)
+		return ret;
+	if (tmp > 0x7f)
+		return -ERANGE;
+
+	ret = regmap_write(priv->regmap, MMA745XL_REG_LDTH, tmp);
+	if (ret)
+		return ret;
+	ret = regmap_write(priv->regmap, MMA745XL_REG_PDTH, tmp);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(mode);
+static DEVICE_ATTR_RW(level);
+static DEVICE_ATTR_RW(threshold);
+
+static struct attribute *mma745xl_sysfs_attrs[] = {
+	&dev_attr_mode.attr,
+	&dev_attr_level.attr,
+	&dev_attr_threshold.attr,
+	NULL
+};
+
+static const struct attribute_group mma745xl_sysfs_group = {
+	.attrs	= mma745xl_sysfs_attrs,
+};
+
+static int mma745xl_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	struct input_dev *input;
+	unsigned int i, irq, val = 0;
+	struct mma745xl *priv;
+	int ret;
+
+	if (!client->dev.of_node)
+		return -ENOTSUPP;
+
+	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
+	input = devm_input_allocate_device(&client->dev);
+	if (!priv || !input)
+		return -ENOMEM;
+
+	priv->regcfg.reg_bits		= 8;
+	priv->regcfg.val_bits		= 8;
+	priv->regcfg.cache_type		= REGCACHE_NONE;
+	priv->regcfg.max_register	= MMA745XL_REG_TW;
+	priv->regmap = devm_regmap_init_i2c(client, &priv->regcfg);
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	/* Check functionality */
+	ret = regmap_read(priv->regmap, MMA745XL_REG_WHOAMI, &val);
+	if (ret || (val != WHOAMI_MMA745XL)) {
+		dev_err(&client->dev, "Probe failed (ID=0x%02x)\n", val);
+		return ret ? : -ENODEV;
+	}
+
+	input->name		= client->name;
+	input->id.bustype	= BUS_I2C;
+	input->id.vendor	= 0x0001;
+	input->id.product	= 0x0001;
+	input->id.version	= 0x0100;
+	input->open		= mma745xl_open;
+	input->close		= mma745xl_close;
+
+	for (i = ABS_X; i <= ABS_Z; i++) {
+		input_set_capability(input, EV_ABS, i);
+		input_set_abs_params(input, i, -512, 511, 0, 0);
+	}
+
+	input_set_drvdata(input, priv);
+	dev_set_drvdata(&client->dev, input);
+
+	/* Put into standby mode, Data ready status not routed to INT1 */
+	ret = regmap_write(priv->regmap, MMA745XL_REG_MCTL, MCTL_DRPD);
+	if (ret)
+		return ret;
+	/* Set bandwidth to 125 kHz */
+	ret = regmap_write(priv->regmap, MMA745XL_REG_CTL1, CTL1_DFBW);
+	if (ret)
+		return ret;
+	/* Set detecting condition to "OR" */
+	ret = regmap_write(priv->regmap, MMA745XL_REG_CTL2, 0);
+	if (ret)
+		return ret;
+	/* Set level detection threshold limit */
+	ret = regmap_write(priv->regmap, MMA745XL_REG_LDTH,
+			   MMA745XL_THRESHOLD_DEF);
+	if (ret)
+		return ret;
+	/* Set pulse detection threshold limit */
+	ret = regmap_write(priv->regmap, MMA745XL_REG_PDTH,
+			   MMA745XL_THRESHOLD_DEF);
+	if (ret)
+		return ret;
+	/* Set pulse duration value */
+	ret = regmap_write(priv->regmap, MMA745XL_REG_PW,
+			   MMA745XL_PULSEW_DEF);
+	if (ret)
+		return ret;
+
+	priv->mode = MMA745XL_MODE_DEF;
+
+	irq = irq_of_parse_and_map(client->dev.of_node, 0);
+	if (!irq)
+		return -EINVAL;
+	ret = devm_request_threaded_irq(&client->dev, irq, NULL,
+					mma745xl_interrupt, IRQF_ONESHOT,
+					dev_name(&client->dev), input);
+	if (ret)
+		return ret;
+
+	irq = irq_of_parse_and_map(client->dev.of_node, 1);
+	if (!irq)
+		return -EINVAL;
+	ret = devm_request_threaded_irq(&client->dev, irq, NULL,
+					mma745xl_interrupt, IRQF_ONESHOT,
+					dev_name(&client->dev), input);
+	if (ret)
+		return ret;
+
+	ret = input_register_device(input);
+	if (ret)
+		return ret;
+
+	return sysfs_create_group(&client->dev.kobj, &mma745xl_sysfs_group);
+}
+
+static int mma745xl_remove(struct i2c_client *client)
+{
+	sysfs_remove_group(&client->dev.kobj, &mma745xl_sysfs_group);
+
+	return 0;
+}
+
+static const struct of_device_id __maybe_unused mma745xl_dt_ids[] = {
+	{ .compatible = "fsl,mma7455l", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mma745xl_dt_ids);
+
+static const struct i2c_device_id mma745xl_ids[] = {
+	{ .name = "mma7455l", },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mma745xl_ids);
+
+static struct i2c_driver mma745xl_driver = {
+	.driver		= {
+		.name		= "mma745xl",
+		.owner		= THIS_MODULE,
+		.of_match_table	= of_match_ptr(mma745xl_dt_ids),
+	},
+	.id_table	= mma745xl_ids,
+	.probe		= mma745xl_probe,
+	.remove		= mma745xl_remove,
+};
+module_i2c_driver(mma745xl_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("MMA745xL 3-Axis Acceleration Sensor");
-- 
1.8.3.2