path: root/drivers/input/misc/ad714x.c

/*
 * AD714X CapTouch Programmable Controller driver supporting AD7142/3/7/8/7A
 *
 * Copyright 2009-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/input/ad714x.h>
#include <linux/module.h>
#include "ad714x.h"

#define AD714X_PWR_CTRL           0x0
#define AD714X_STG_CAL_EN_REG     0x1
#define AD714X_AMB_COMP_CTRL0_REG 0x2
#define AD714X_PARTID_REG         0x17
#define AD7142_PARTID             0xE620
#define AD7143_PARTID             0xE630
#define AD7147_PARTID             0x1470
#define AD7148_PARTID             0x1480
#define AD714X_STAGECFG_REG       0x80
#define AD714X_SYSCFG_REG         0x0

#define STG_LOW_INT_EN_REG     0x5
#define STG_HIGH_INT_EN_REG    0x6
#define STG_COM_INT_EN_REG     0x7
#define STG_LOW_INT_STA_REG    0x8
#define STG_HIGH_INT_STA_REG   0x9
#define STG_COM_INT_STA_REG    0xA

#define CDC_RESULT_S0          0xB
#define CDC_RESULT_S1          0xC
#define CDC_RESULT_S2          0xD
#define CDC_RESULT_S3          0xE
#define CDC_RESULT_S4          0xF
#define CDC_RESULT_S5          0x10
#define CDC_RESULT_S6          0x11
#define CDC_RESULT_S7          0x12
#define CDC_RESULT_S8          0x13
#define CDC_RESULT_S9          0x14
#define CDC_RESULT_S10         0x15
#define CDC_RESULT_S11         0x16

#define STAGE0_AMBIENT		0xF1
#define STAGE1_AMBIENT		0x115
#define STAGE2_AMBIENT		0x139
#define STAGE3_AMBIENT		0x15D
#define STAGE4_AMBIENT		0x181
#define STAGE5_AMBIENT		0x1A5
#define STAGE6_AMBIENT		0x1C9
#define STAGE7_AMBIENT		0x1ED
#define STAGE8_AMBIENT		0x211
#define STAGE9_AMBIENT		0x234
#define STAGE10_AMBIENT		0x259
#define STAGE11_AMBIENT		0x27D

#define PER_STAGE_REG_NUM      36
#define STAGE_CFGREG_NUM       8
#define SYS_CFGREG_NUM         8

/*
 * driver information which will be used to maintain the software flow
 */
enum ad714x_device_state { IDLE, JITTER, ACTIVE, SPACE };

struct ad714x_slider_drv {
	int highest_stage;
	int abs_pos;
	int flt_pos;
	enum ad714x_device_state state;
	struct input_dev *input;
};

struct ad714x_wheel_drv {
	int abs_pos;
	int flt_pos;
	int pre_highest_stage;
	int highest_stage;
	enum ad714x_device_state state;
	struct input_dev *input;
};

struct ad714x_touchpad_drv {
	int x_highest_stage;
	int x_flt_pos;
	int x_abs_pos;
	int y_highest_stage;
	int y_flt_pos;
	int y_abs_pos;
	int left_ep;
	int left_ep_val;
	int right_ep;
	int right_ep_val;
	int top_ep;
	int top_ep_val;
	int bottom_ep;
	int bottom_ep_val;
	enum ad714x_device_state state;
	struct input_dev *input;
};

struct ad714x_button_drv {
	enum ad714x_device_state state;
	/*
	 * Unlike slider/wheel/touchpad, all buttons point to
	 * same input_dev instance
	 */
	struct input_dev *input;
};

struct ad714x_driver_data {
	struct ad714x_slider_drv *slider;
	struct ad714x_wheel_drv *wheel;
	struct ad714x_touchpad_drv *touchpad;
	struct ad714x_button_drv *button;
};

/*
 * information to integrate all things which will be private data
 * of spi/i2c device
 */

static void ad714x_use_com_int(struct ad714x_chip *ad714x,
				int start_stage, int end_stage)
{
	unsigned short data;
	unsigned short mask;

	mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1);

	ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1);
	data |= 1 <<</