path: root/drivers/input/mouse/cyapa.c

/*
 * Cypress APA trackpad with I2C interface
 *
 * Author: Dudley Du <dudl@cypress.com>
 * Further cleanup and restructuring by:
 *   Daniel Kurtz <djkurtz@chromium.org>
 *   Benson Leung <bleung@chromium.org>
 *
 * Copyright (C) 2011-2012 Cypress Semiconductor, Inc.
 * Copyright (C) 2011-2012 Google, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>

/* APA trackpad firmware generation */
#define CYAPA_GEN3   0x03   /* support MT-protocol B with tracking ID. */

#define CYAPA_NAME   "Cypress APA Trackpad (cyapa)"

/* commands for read/write registers of Cypress trackpad */
#define CYAPA_CMD_SOFT_RESET       0x00
#define CYAPA_CMD_POWER_MODE       0x01
#define CYAPA_CMD_DEV_STATUS       0x02
#define CYAPA_CMD_GROUP_DATA       0x03
#define CYAPA_CMD_GROUP_CMD        0x04
#define CYAPA_CMD_GROUP_QUERY      0x05
#define CYAPA_CMD_BL_STATUS        0x06
#define CYAPA_CMD_BL_HEAD          0x07
#define CYAPA_CMD_BL_CMD           0x08
#define CYAPA_CMD_BL_DATA          0x09
#define CYAPA_CMD_BL_ALL           0x0a
#define CYAPA_CMD_BLK_PRODUCT_ID   0x0b
#define CYAPA_CMD_BLK_HEAD         0x0c

/* report data start reg offset address. */
#define DATA_REG_START_OFFSET  0x0000

#define BL_HEAD_OFFSET 0x00
#define BL_DATA_OFFSET 0x10

/*
 * Operational Device Status Register
 *
 * bit 7: Valid interrupt source
 * bit 6 - 4: Reserved
 * bit 3 - 2: Power status
 * bit 1 - 0: Device status
 */
#define REG_OP_STATUS     0x00
#define OP_STATUS_SRC     0x80
#define OP_STATUS_POWER   0x0c
#define OP_STATUS_DEV     0x03
#define OP_STATUS_MASK (OP_STATUS_SRC | OP_STATUS_POWER | OP_STATUS_DEV)

/*
 * Operational Finger Count/Button Flags Register
 *
 * bit 7 - 4: Number of touched finger
 * bit 3: Valid data
 * bit 2: Middle Physical Button
 * bit 1: Right Physical Button
 * bit 0: Left physical Button
 */
#define REG_OP_DATA1       0x01
#define OP_DATA_VALID      0x08
#define OP_DATA_MIDDLE_BTN 0x04
#define OP_DATA_RIGHT_BTN  0x02
#define OP_DATA_LEFT_BTN   0x01
#define OP_DATA_BTN_MASK (OP_DATA_MIDDLE_BTN | OP_DATA_RIGHT_BTN | \
			  OP_DATA_LEFT_BTN)

/*
 * Bootloader Status Register
 *
 * bit 7: Busy
 * bit 6 - 5: Reserved
 * bit 4: Bootloader running
 * bit 3 - 1: Reserved
 * bit 0: Checksum valid
 */
#define REG_BL_STATUS        0x01
#define BL_STATUS_BUSY       0x80
#define BL_STATUS_RUNNING    0x10
#define BL_STATUS_DATA_VALID 0x08
#define BL_STATUS_CSUM_VALID 0x01

/*
 * Bootloader Error Register
 *
 * bit 7: Invalid
 * bit 6: Invalid security key
 * bit 5: Bootloading
 * bit 4: Command checksum
 * bit 3: Flash protection error
 * bit 2: Flash checksum error
 * bit 1 - 0: Reserved
 */
#define REG_BL_ERROR         0x02
#define BL_ERROR_INVALID     0x80
#define BL_ERROR_INVALID_KEY 0x40
#define BL_ERROR_BOOTLOADING 0x20
#define BL_ERROR_CMD_CSUM    0x10
#define BL_ERROR_FLASH_PROT  0x08
#define BL_ERROR_FLASH_CSUM  0x04

#define BL_STATUS_SIZE  3  /* length of bootloader status registers */
#define BLK_HEAD_BYTES 32

#define PRODUCT_ID_SIZE  16
#define QUERY_DATA_SIZE  27
#define REG_PROTOCOL_GEN_QUERY_OFFSET  20

#define REG_OFFSET_DATA_BASE     0x0000
#define REG_OFFSET_COMMAND_BASE  0x0028
#define REG_OFFSET_QUERY_BASE    0x002a

#define CAPABILITY_LEFT_BTN_MASK	(0x01 << 3)
#define CAPABILITY_RIGHT_BTN_MASK	(0x01 << 4)
#define CAPABILITY_MIDDLE_BTN_MASK	(0x01 << 5)
#define CAPABILITY_BTN_MASK  (CAPABILITY_LEFT_BTN_MASK | \
			      CAPABILITY_RIGHT_BTN_MASK | \
			      CAPABILITY_MIDDLE_BTN_MASK)

#define CYAPA_OFFSET_SOFT_RESET  REG_OFFSET_COMMAND_BASE

#define REG_OFFSET_POWER_MODE (REG_OFFSET_COMMAND_BASE + 1)

#define PWR_MODE_MASK   0xfc
#define PWR_MODE_FULL_ACTIVE (0x3f << 2)
#define PWR_MODE_IDLE        (0x05 << 2) /* default sleep time is 50 ms. */
#define PWR_MODE_OFF         (0x00 << 2)

#define PWR_STATUS_MASK      0x0c
#define PWR_STATUS_ACTIVE    (0x03 << 2)
#define PWR_STATUS_IDLE      (0x02 << 2)
#define PWR_STATUS_OFF       (0x00 << 2)

/*
 * CYAPA trackpad device states.
 * Used in register 0x00, bit1-0, DeviceStatus field.
 * Other values indicate device is in an abnormal state and must be reset.
 */
#define CYAPA_DEV_NORMAL  0x03
#define CYAPA_DEV_BUSY    0x01

enum cyapa_state {
	CYAPA_STATE_OP,
	CYAPA_STATE_BL_IDLE,
	CYAPA_STATE_BL_ACTIVE,
	CYAPA_STATE_BL_BUSY,
	CYAPA_STATE_NO_DEVICE,
};


struct cyapa_touch {
	/*
	 * high bits or x/y position value
	 * bit 7 - 4: high 4 bits of x position value
	 * bit 3 - 0: high 4 bits of y position value
	 */
	u8 xy_hi;
	u8 x_lo;  /* low 8 bits of x position value. */
	u8 y_lo;  /* low 8 bits of y position value. */
	u8 pressure;
	/* id range is 1 - 15.  It is incremented with every new touch. */
	u8 id;
} __packed;

/* The touch.id is used as the MT slot id, thus max MT slot is 15 */
#define CYAPA_MAX_MT_SLOTS  15

struct cyapa_reg_data {
	/*
	 * bit 0 - 1: device status
	 * bit 3 - 2: power mode
	 * bit 6 - 4: reserved
	 * bit 7: interrupt valid bit
	 */
	u8 device_status;
	/*
	 * bit 7 - 4: number of fingers currently touching pad
	 * bit 3: valid data check bit
	 * bit 2: middle mechanism button state if exists
	 * bit 1: right mechanism button state if exists
	 * bit 0: left mechanism button state if exists
	 */
	u8 finger_btn;
	/* CYAPA reports up to 5 touches per packet. */
	struct cyapa_touch touches[5];
} __packed;

/* The main device structure */
struct cyapa {
	enum cyapa_state state;

	struct i2c_client *client;
	struct input_dev *input;
	char phys[32];	/* device physical location */
	int irq;
	bool irq_wake;  /* irq wake is enabled */

	/* read from query data region. */
	char product_id[16];
	u8 btn_capability;
	u8 gen;
	int max_abs_x;
	int max_abs_y;
	int physical_size_x;
	int physical_size_y;
};

static const u8 bl_deactivate[] = { 0x00, 0xff, 0x3b, 0x00, 0x01, 0x02, 0x03,
		0x04, 0x05, 0x06, 0x07 };
static const u8 bl_exit[] = { 0x00, 0xff, 0xa5, 0x00, 0x01, 0x02, 0x03, 0x04,
		0x05, 0x06, 0x07 };

struct cyapa_cmd_len {
	u8 cmd;
	u8 len;
};

static const struct cyapa_cmd_len cyapa_i2c_cmds[] = {
	{ CYAPA_OFFSET_SOFT_RESET, 1 },
	{ REG_OFFSET_COMMAND_BASE + 1, 1 },
	{ REG_OFFSET_DATA_BASE, 1 },
	{ REG_OFFSET_DATA_BASE, sizeof(struct cyapa_reg_data) },
	{ REG_OFFSET_COMMAND_BASE, 0 },
	{ REG_OFFSET_QUERY_BASE, QUERY_DATA_SIZE },
	{ BL_HEAD_OFFSET, 3 },
	{ BL_HEAD_OFFSET, 16 },
	{ BL_HEAD_OFFSET, 16 },
	{ BL_DATA_OFFSET, 16 },
	{ BL_HEAD_OFFSET, 32 },
	{ REG_OFFSET_QUERY_BASE, PRODUCT_ID_SIZE },
	{ REG_OFFSET_DATA_BASE, 32 }
};

static ssize_t cyapa_i2c_reg_read_block(struct cyapa *cyapa, u8 reg, size_t len,
					u8 *values)
{
	return i2c_smbus_read_i2c_block_data(cyapa->client, reg, len, values);
}

static ssize_t cyapa_i2c_reg_write_block(struct cyapa *cyapa, u8 reg,
					 size_t len, const u8 *values)
{
	return i2c_smbus_write_i2c_block_data(cyapa->client, reg, len, values);
}

static s32 cyapa_read_byte(struct cyapa *cyapa, u8 cmd_idx)
{
	u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;

	return i2c_smbus_read_byte_data(cyapa->client, cmd);
}

static s32 cyapa_write_byte(struct cyapa *cyapa, u8 cmd_idx, u8 value)
{
	u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;

	return i2c_smbus_write_byte_data(cyapa->client, cmd, value);
}

static ssize_t cyapa_read_block(struct cyapa *cyapa, u8 cmd_idx, u8 *values)
{
	u8 cmd = cyapa_i2c_cmds[cmd_idx].cmd;
	size_t len = cyapa_i2c_cmds[cmd_idx].len;

	return cyapa_i2c_reg_read_block(cyapa, cmd, len, values);
}

/*
 * Query device for its current operating state.
 *
 */
static int cyapa_get_state(struct cyapa *cyapa)
{
	int ret;
	u8 status[BL_STATUS_SIZE];

	cyapa->state = CYAPA_STATE_NO_DEVICE;

	/*
	 * Get trackpad status by reading 3 registers starting from 0.
	 * If the device is in the bootloader, this will be BL_HEAD.
	 * If the device is in operation mode, this will be the DATA regs.
	 *
	 */
	ret