iio: add driver for Freescale MMA9553

Add support for Freescale MMA9553L Intelligent Pedometer Platform.

The following functionalities are supported:
 - step counter (counts the number of steps using a HW register)
 - step detector (generates an iio event at every step the user takes)
 - activity recognition (rest, walking, jogging, running)
 - speed
 - calories
 - distance

To get accurate pedometer results, the user's height, weight and gender
need to be configured.

The specifications can be downloaded from:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA955xLSWRM.pdf
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Documentation/ABI/testing/sysfs-bus-iio

@@ -343,7 +343,30 @@ Description:
 		production inaccuracies).  If shared across all channels,
 		<type>_calibscale is used.
 
-What:		/sys/bus/iio/devices/iio:deviceX/in_steps_calibheight
+What:		/sys/bus/iio/devices/iio:deviceX/in_activity_calibgender
+What:		/sys/bus/iio/devices/iio:deviceX/in_energy_calibgender
+What:		/sys/bus/iio/devices/iio:deviceX/in_distance_calibgender
+What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_calibgender
+KernelVersion:	3.20
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Gender of the user (e.g.: male, female) used by some pedometers
+		to compute the stride length, distance, speed and activity
+		type.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_activity_calibgender_available
+What:		/sys/bus/iio/devices/iio:deviceX/in_energy_calibgender_available
+What:		/sys/bus/iio/devices/iio:deviceX/in_distance_calibgender_available
+What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_calibgender_available
+KernelVersion:	3.20
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Lists all available gender values (e.g.: male, female).
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_activity_calibheight
+What:		/sys/bus/iio/devices/iio:deviceX/in_energy_calibheight
+What:		/sys/bus/iio/devices/iio:deviceX/in_distance_calibheight
+What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_calibheight
 KernelVersion:	3.19
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -818,6 +841,14 @@ What:		/sys/.../events/in_tempY_roc_falling_period
 What:		/sys/.../events/in_accel_x&y&z_mag_falling_period
 What:		/sys/.../events/in_intensity0_thresh_period
 What:		/sys/.../events/in_proximity0_thresh_period
+What:		/sys/.../events/in_activity_still_thresh_rising_period
+What:		/sys/.../events/in_activity_still_thresh_falling_period
+What:		/sys/.../events/in_activity_walking_thresh_rising_period
+What:		/sys/.../events/in_activity_walking_thresh_falling_period
+What:		/sys/.../events/in_activity_jogging_thresh_rising_period
+What:		/sys/.../events/in_activity_jogging_thresh_falling_period
+What:		/sys/.../events/in_activity_running_thresh_rising_period
+What:		/sys/.../events/in_activity_running_thresh_falling_period
 KernelVersion:	2.6.37
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -1142,6 +1173,12 @@ Description:
 		This attribute is used to get/set the integration time in
 		seconds.
 
+What:		/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_integration_time
+KernelVersion:	3.20
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Number of seconds in which to compute speed.
+
 What:		/sys/bus/iio/devices/iio:deviceX/in_rot_quaternion_raw
 KernelVersion:	3.15
 Contact:	linux-iio@vger.kernel.org
@@ -1170,13 +1207,17 @@ Description:
 		present, output should be considered as processed with the
 		unit in milliamps.
 
+What:		/sys/.../iio:deviceX/in_energy_en
+What:		/sys/.../iio:deviceX/in_distance_en
+What:		/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_en
 What:		/sys/.../iio:deviceX/in_steps_en
 KernelVersion:	3.19
 Contact:	linux-iio@vger.kernel.org
 Description:
-		Activates the step counter. After activation, the number of steps
+		Activates a device feature that runs in firmware/hardware.
-		taken by the user will be counted in hardware and exported through
+		E.g. for steps: the pedometer saves power while not used;
-		in_steps_input.
+		when activated, it will count the steps taken by the user in
+		firmware and export them through in_steps_input.
 
 What:		/sys/.../iio:deviceX/in_steps_input
 KernelVersion:	3.19

drivers/iio/accel/Kconfig

@@ -126,4 +126,14 @@ config MMA9551
 	  To compile this driver as a module, choose M here: the module
 	  will be called mma9551.
 
+config MMA9553
+	tristate "Freescale MMA9553L Intelligent Pedometer Platform Driver"
+	depends on I2C
+	select MMA9551_CORE
+	help
+	  Say yes here to build support for the Freescale MMA9553L
+	  Intelligent Pedometer Platform Driver.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called mma9553.
 endmenu

drivers/iio/accel/Makefile

@@ -12,6 +12,7 @@ obj-$(CONFIG_MMA8452)	+= mma8452.o
 
 obj-$(CONFIG_MMA9551_CORE)	+= mma9551_core.o
 obj-$(CONFIG_MMA9551)		+= mma9551.o
+obj-$(CONFIG_MMA9553)		+= mma9553.o
 
 obj-$(CONFIG_IIO_SSP_SENSORS_COMMONS) += ssp_accel_sensor.o
 

drivers/iio/accel/mma9551_core.c

@@ -53,6 +53,11 @@
 #define MMA9551_AFE_Y_ACCEL_REG		0x02
 #define MMA9551_AFE_Z_ACCEL_REG		0x04
 
+/* Reset/Suspend/Clear application */
+#define MMA9551_RSC_RESET		0x00
+#define MMA9551_RSC_OFFSET(mask)	(3 - (ffs(mask) - 1) / 8)
+#define MMA9551_RSC_VAL(mask)		(mask >> (((ffs(mask) - 1) / 8) * 8))
+
 /*
  * A response is composed of:
  * - control registers: MB0-3
@@ -274,6 +279,64 @@ int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
 }
 EXPORT_SYMBOL(mma9551_read_status_byte);
 
+/**
+ * mma9551_read_config_word() - read 1 config word
+ * @client:	I2C client
+ * @app_id:	Application ID
+ * @reg:	Application register
+ * @val:	Pointer to store value read
+ *
+ * Read one configuration word from the device using MMA955xL command format.
+ * Commands to the MMA955xL platform consist of a write followed by one or
+ * more reads.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+int mma9551_read_config_word(struct i2c_client *client, u8 app_id,
+			    u16 reg, u16 *val)
+{
+	int ret;
+	__be16 v;
+
+	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
+			       reg, NULL, 0, (u8 *)&v, 2);
+	*val = be16_to_cpu(v);
+
+	return ret;
+}
+EXPORT_SYMBOL(mma9551_read_config_word);
+
+/**
+ * mma9551_write_config_word() - write 1 config word
+ * @client:	I2C client
+ * @app_id:	Application ID
+ * @reg:	Application register
+ * @val:	Value to write
+ *
+ * Write one configuration word from the device using MMA955xL command format.
+ * Commands to the MMA955xL platform consist of a write followed by one or
+ * more reads.
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+int mma9551_write_config_word(struct i2c_client *client, u8 app_id,
+			     u16 reg, u16 val)
+{
+	__be16 v = cpu_to_be16(val);
+
+	return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
+				(u8 *) &v, 2, NULL, 0);
+}
+EXPORT_SYMBOL(mma9551_write_config_word);
+
 /**
  * mma9551_read_status_word() - read 1 status word
  * @client:	I2C client
@@ -305,6 +368,107 @@ int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
 }
 EXPORT_SYMBOL(mma9551_read_status_word);
 
+/**
+ * mma9551_read_config_words() - read multiple config words
+ * @client:	I2C client
+ * @app_id:	Application ID
+ * @reg:	Application register
+ * @len:	Length of array to read in bytes
+ * @val:	Array of words to read
+ *
+ * Read multiple configuration registers (word-sized registers).
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+int mma9551_read_config_words(struct i2c_client *client, u8 app_id,
+			     u16 reg, u8 len, u16 *buf)
+{
+	int ret, i;
+	int len_words = len / sizeof(u16);
+	__be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS];
+
+	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
+			       reg, NULL, 0, (u8 *) be_buf, len);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < len_words; i++)
+		buf[i] = be16_to_cpu(be_buf[i]);
+
+	return 0;
+}
+EXPORT_SYMBOL(mma9551_read_config_words);
+
+/**
+ * mma9551_read_status_words() - read multiple status words
+ * @client:	I2C client
+ * @app_id:	Application ID
+ * @reg:	Application register
+ * @len:	Length of array to read in bytes
+ * @val:	Array of words to read
+ *
+ * Read multiple status registers (word-sized registers).
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+int mma9551_read_status_words(struct i2c_client *client, u8 app_id,
+			      u16 reg, u8 len, u16 *buf)
+{
+	int ret, i;
+	int len_words = len / sizeof(u16);
+	__be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS];
+
+	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
+			       reg, NULL, 0, (u8 *) be_buf, len);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < len_words; i++)
+		buf[i] = be16_to_cpu(be_buf[i]);
+
+	return 0;
+}
+EXPORT_SYMBOL(mma9551_read_status_words);
+
+/**
+ * mma9551_write_config_words() - write multiple config words
+ * @client:	I2C client
+ * @app_id:	Application ID
+ * @reg:	Application register
+ * @len:	Length of array to write in bytes
+ * @val:	Array of words to write
+ *
+ * Write multiple configuration registers (word-sized registers).
+ *
+ * Locking note: This function must be called with the device lock held.
+ * Locking is not handled inside the function. Callers should ensure they
+ * serialize access to the HW.
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+int mma9551_write_config_words(struct i2c_client *client, u8 app_id,
+			       u16 reg, u8 len, u16 *buf)
+{
+	int i;
+	int len_words = len / sizeof(u16);
+	__be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS];
+
+	for (i = 0; i < len_words; i++)
+		be_buf[i] = cpu_to_be16(buf[i]);
+
+	return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG,
+				reg, (u8 *) be_buf, len, NULL, 0);
+}
+EXPORT_SYMBOL(mma9551_write_config_words);
+
 /**
  * mma9551_update_config_bits() - update bits in register
  * @client:	I2C client
@@ -609,6 +773,25 @@ int mma9551_read_accel_scale(int *val, int *val2)
 }
 EXPORT_SYMBOL(mma9551_read_accel_scale);
 
+/**
+ * mma9551_app_reset() - reset application
+ * @client:	I2C client
+ * @app_mask:	Application to reset
+ *
+ * Reset the given application (using the Reset/Suspend/Clear
+ * Control Application)
+ *
+ * Returns: 0 on success, negative value on failure.
+ */
+int mma9551_app_reset(struct i2c_client *client, u32 app_mask)
+{
+	return mma9551_write_config_byte(client, MMA9551_APPID_RCS,
+					 MMA9551_RSC_RESET +
+					 MMA9551_RSC_OFFSET(app_mask),
+					 MMA9551_RSC_VAL(app_mask));
+}
+EXPORT_SYMBOL(mma9551_app_reset);
+
 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
 MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
 MODULE_LICENSE("GPL v2");

drivers/iio/accel/mma9551_core.h

@@ -21,9 +21,13 @@
 #define MMA9551_APPID_AFE		0x06
 #define MMA9551_APPID_TILT		0x0B
 #define MMA9551_APPID_SLEEP_WAKE	0x12
-#define MMA9551_APPID_RESET		0x17
+#define MMA9551_APPID_PEDOMETER	        0x15
+#define MMA9551_APPID_RCS		0x17
 #define MMA9551_APPID_NONE		0xff
 
+/* Reset/Suspend/Clear application app masks */
+#define MMA9551_RSC_PED			BIT(21)
+
 #define MMA9551_AUTO_SUSPEND_DELAY_MS	2000
 
 enum mma9551_gpio_pin {
@@ -48,8 +52,18 @@ int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
 			      u16 reg, u8 val);
 int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
 			     u16 reg, u8 *val);
+int mma9551_read_config_word(struct i2c_client *client, u8 app_id,
+			    u16 reg, u16 *val);
+int mma9551_write_config_word(struct i2c_client *client, u8 app_id,
+			     u16 reg, u16 val);
 int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
 			     u16 reg, u16 *val);
+int mma9551_read_config_words(struct i2c_client *client, u8 app_id,
+			     u16 reg, u8 len, u16 *buf);
+int mma9551_read_status_words(struct i2c_client *client, u8 app_id,
+			      u16 reg, u8 len, u16 *buf);
+int mma9551_write_config_words(struct i2c_client *client, u8 app_id,
+			       u16 reg, u8 len, u16 *buf);
 int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
 			       u16 reg, u8 mask, u8 val);
 int mma9551_gpio_config(struct i2c_client *client, enum mma9551_gpio_pin pin,
@@ -62,5 +76,6 @@ int mma9551_read_accel_chan(struct i2c_client *client,
 			    const struct iio_chan_spec *chan,
 			    int *val, int *val2);
 int mma9551_read_accel_scale(int *val, int *val2);
+int mma9551_app_reset(struct i2c_client *client, u32 app_mask);
 
 #endif /* _MMA9551_CORE_H_ */