Input: synaptics-rmi4 - add support for Synaptics RMI4 devices

Synaptics uses the Register Mapped Interface (RMI) protocol as a
communications interface for their devices. This driver adds the core
functionality needed to interface with RMI4 devices.

RMI devices can be connected to the host via several transport protocols
and can supports a wide variety of functionality defined by RMI functions.
Support for transport protocols and RMI functions are implemented in
individual drivers. The RMI4 core driver uses a bus architecture to
facilitate the various combinations of transport and function drivers
needed by a particular device.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Christopher Heiny <cheiny@synaptics.com>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 209 insertions, 0 deletions

diff --git a/include/linux/rmi.h b/include/linux/rmi.h
new file mode 100644
index 000000000000..c748fa302067
--- /dev/null
+++ b/include/linux/rmi.h
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2011-2016 Synaptics Incorporated
+ * Copyright (c) 2011 Unixphere
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef _RMI_H
+#define _RMI_H
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#define NAME_BUFFER_SIZE 256
+
+/**
+ * struct rmi_f01_power - override default power management settings.
+ *
+ */
+enum rmi_f01_nosleep {
+	RMI_F01_NOSLEEP_DEFAULT = 0,
+	RMI_F01_NOSLEEP_OFF = 1,
+	RMI_F01_NOSLEEP_ON = 2
+};
+
+/**
+ * struct rmi_f01_power_management -When non-zero, these values will be written
+ * to the touch sensor to override the default firmware settigns.  For a
+ * detailed explanation of what each field does, see the corresponding
+ * documention in the RMI4 specification.
+ *
+ * @nosleep - specifies whether the device is permitted to sleep or doze (that
+ * is, enter a temporary low power state) when no fingers are touching the
+ * sensor.
+ * @wakeup_threshold - controls the capacitance threshold at which the touch
+ * sensor will decide to wake up from that low power state.
+ * @doze_holdoff - controls how long the touch sensor waits after the last
+ * finger lifts before entering the doze state, in units of 100ms.
+ * @doze_interval - controls the interval between checks for finger presence
+ * when the touch sensor is in doze mode, in units of 10ms.
+ */
+struct rmi_f01_power_management {
+	enum rmi_f01_nosleep nosleep;
+	u8 wakeup_threshold;
+	u8 doze_holdoff;
+	u8 doze_interval;
+};
+
+/**
+ * struct rmi_device_platform_data - system specific configuration info.
+ *
+ * @reset_delay_ms - after issuing a reset command to the touch sensor, the
+ * driver waits a few milliseconds to give the firmware a chance to
+ * to re-initialize.  You can override the default wait period here.
+ */
+struct rmi_device_platform_data {
+	int reset_delay_ms;
+
+	/* function handler pdata */
+	struct rmi_f01_power_management power_management;
+};
+
+/**
+ * struct rmi_function_descriptor - RMI function base addresses
+ *
+ * @query_base_addr: The RMI Query base address
+ * @command_base_addr: The RMI Command base address
+ * @control_base_addr: The RMI Control base address
+ * @data_base_addr: The RMI Data base address
+ * @interrupt_source_count: The number of irqs this RMI function needs
+ * @function_number: The RMI function number
+ *
+ * This struct is used when iterating the Page Description Table. The addresses
+ * are 16-bit values to include the current page address.
+ *
+ */
+struct rmi_function_descriptor {
+	u16 query_base_addr;
+	u16 command_base_addr;
+	u16 control_base_addr;
+	u16 data_base_addr;
+	u8 interrupt_source_count;
+	u8 function_number;
+	u8 function_version;
+};
+
+struct rmi_device;
+
+/**
+ * struct rmi_transport_dev - represent an RMI transport device
+ *
+ * @dev: Pointer to the communication device, e.g. i2c or spi
+ * @rmi_dev: Pointer to the RMI device
+ * @proto_name: name of the transport protocol (SPI, i2c, etc)
+ * @ops: pointer to transport operations implementation
+ *
+ * The RMI transport device implements the glue between different communication
+ * buses such as I2C and SPI.
+ *
+ */
+struct rmi_transport_dev {
+	struct device *dev;
+	struct rmi_device *rmi_dev;
+
+	const char *proto_name;
+	const struct rmi_transport_ops *ops;
+
+	struct rmi_device_platform_data pdata;
+
+	struct input_dev *input;
+
+	void *attn_data;
+	int attn_size;
+};
+
+/**
+ * struct rmi_transport_ops - defines transport protocol operations.
+ *
+ * @write_block: Writing a block of data to the specified address
+ * @read_block: Read a block of data from the specified address.
+ */
+struct rmi_transport_ops {
+	int (*write_block)(struct rmi_transport_dev *xport, u16 addr,
+			   const void *buf, size_t len);
+	int (*read_block)(struct rmi_transport_dev *xport, u16 addr,
+			  void *buf, size_t len);
+	int (*reset)(struct rmi_transport_dev *xport, u16 reset_addr);
+};
+
+/**
+ * struct rmi_driver - driver for an RMI4 sensor on the RMI bus.
+ *
+ * @driver: Device driver model driver
+ * @reset_handler: Called when a reset is detected.
+ * @clear_irq_bits: Clear the specified bits in the current interrupt mask.
+ * @set_irq_bist: Set the specified bits in the current interrupt mask.
+ * @store_productid: Callback for cache product id from function 01
+ * @data: Private data pointer
+ *
+ */
+struct rmi_driver {
+	struct device_driver driver;
+
+	int (*reset_handler)(struct rmi_device *rmi_dev);
+	int (*clear_irq_bits)(struct rmi_device *rmi_dev, unsigned long *mask);
+	int (*set_irq_bits)(struct rmi_device *rmi_dev, unsigned long *mask);
+	int (*store_productid)(struct rmi_device *rmi_dev);
+	int (*set_input_params)(struct rmi_device *rmi_dev,
+			struct input_dev *input);
+	void *data;
+};
+
+/**
+ * struct rmi_device - represents an RMI4 sensor device on the RMI bus.
+ *
+ * @dev: The device created for the RMI bus
+ * @number: Unique number for the device on the bus.
+ * @driver: Pointer to associated driver
+ * @xport: Pointer to the transport interface
+ *
+ */
+struct rmi_device {
+	struct device dev;
+	int number;
+
+	struct rmi_driver *driver;
+	struct rmi_transport_dev *xport;
+
+};
+
+struct rmi_driver_data {
+	struct list_head function_list;
+
+	struct rmi_device *rmi_dev;
+
+	struct rmi_function *f01_container;
+	bool f01_bootloader_mode;
+
+	u32 attn_count;
+	int num_of_irq_regs;
+	int irq_count;
+	unsigned long *irq_status;
+	unsigned long *fn_irq_bits;
+	unsigned long *current_irq_mask;
+	unsigned long *new_irq_mask;
+	struct mutex irq_mutex;
+	struct input_dev *input;
+
+	u8 pdt_props;
+	u8 bsr;
+
+	bool enabled;
+
+	void *data;
+};
+
+int rmi_register_transport_device(struct rmi_transport_dev *xport);
+void rmi_unregister_transport_device(struct rmi_transport_dev *xport);
+int rmi_process_interrupt_requests(struct rmi_device *rmi_dev);
+
+int rmi_driver_suspend(struct rmi_device *rmi_dev);
+int rmi_driver_resume(struct rmi_device *rmi_dev);
+#endif