atmel_mxt_ts.c 29.3 KB
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/*
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 * Atmel maXTouch Touchscreen driver
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 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 * 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/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
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#include <linux/i2c/atmel_mxt_ts.h>
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#include <linux/input/mt.h>
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#include <linux/interrupt.h>
#include <linux/slab.h>

/* Version */
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#define MXT_VER_20		20
#define MXT_VER_21		21
#define MXT_VER_22		22
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/* Slave addresses */
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#define MXT_APP_LOW		0x4a
#define MXT_APP_HIGH		0x4b
#define MXT_BOOT_LOW		0x24
#define MXT_BOOT_HIGH		0x25
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/* Firmware */
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#define MXT_FW_NAME		"maxtouch.fw"
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/* Registers */
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#define MXT_INFO		0x00
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#define MXT_FAMILY_ID		0x00
#define MXT_VARIANT_ID		0x01
#define MXT_VERSION		0x02
#define MXT_BUILD		0x03
#define MXT_MATRIX_X_SIZE	0x04
#define MXT_MATRIX_Y_SIZE	0x05
#define MXT_OBJECT_NUM		0x06
#define MXT_OBJECT_START	0x07
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#define MXT_OBJECT_SIZE		6
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/* Object types */
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#define MXT_DEBUG_DIAGNOSTIC_T37	37
#define MXT_GEN_MESSAGE_T5		5
#define MXT_GEN_COMMAND_T6		6
#define MXT_GEN_POWER_T7		7
#define MXT_GEN_ACQUIRE_T8		8
#define MXT_GEN_DATASOURCE_T53		53
#define MXT_TOUCH_MULTI_T9		9
#define MXT_TOUCH_KEYARRAY_T15		15
#define MXT_TOUCH_PROXIMITY_T23		23
#define MXT_TOUCH_PROXKEY_T52		52
#define MXT_PROCI_GRIPFACE_T20		20
#define MXT_PROCG_NOISE_T22		22
#define MXT_PROCI_ONETOUCH_T24		24
#define MXT_PROCI_TWOTOUCH_T27		27
#define MXT_PROCI_GRIP_T40		40
#define MXT_PROCI_PALM_T41		41
#define MXT_PROCI_TOUCHSUPPRESSION_T42	42
#define MXT_PROCI_STYLUS_T47		47
#define MXT_PROCG_NOISESUPPRESSION_T48	48
#define MXT_SPT_COMMSCONFIG_T18		18
#define MXT_SPT_GPIOPWM_T19		19
#define MXT_SPT_SELFTEST_T25		25
#define MXT_SPT_CTECONFIG_T28		28
#define MXT_SPT_USERDATA_T38		38
#define MXT_SPT_DIGITIZER_T43		43
#define MXT_SPT_MESSAGECOUNT_T44	44
#define MXT_SPT_CTECONFIG_T46		46

/* MXT_GEN_COMMAND_T6 field */
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#define MXT_COMMAND_RESET	0
#define MXT_COMMAND_BACKUPNV	1
#define MXT_COMMAND_CALIBRATE	2
#define MXT_COMMAND_REPORTALL	3
#define MXT_COMMAND_DIAGNOSTIC	5

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/* MXT_GEN_POWER_T7 field */
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#define MXT_POWER_IDLEACQINT	0
#define MXT_POWER_ACTVACQINT	1
#define MXT_POWER_ACTV2IDLETO	2

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/* MXT_GEN_ACQUIRE_T8 field */
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#define MXT_ACQUIRE_CHRGTIME	0
#define MXT_ACQUIRE_TCHDRIFT	2
#define MXT_ACQUIRE_DRIFTST	3
#define MXT_ACQUIRE_TCHAUTOCAL	4
#define MXT_ACQUIRE_SYNC	5
#define MXT_ACQUIRE_ATCHCALST	6
#define MXT_ACQUIRE_ATCHCALSTHR	7

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/* MXT_TOUCH_MULTI_T9 field */
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#define MXT_TOUCH_CTRL		0
#define MXT_TOUCH_XORIGIN	1
#define MXT_TOUCH_YORIGIN	2
#define MXT_TOUCH_XSIZE		3
#define MXT_TOUCH_YSIZE		4
#define MXT_TOUCH_BLEN		6
#define MXT_TOUCH_TCHTHR	7
#define MXT_TOUCH_TCHDI		8
#define MXT_TOUCH_ORIENT	9
#define MXT_TOUCH_MOVHYSTI	11
#define MXT_TOUCH_MOVHYSTN	12
#define MXT_TOUCH_NUMTOUCH	14
#define MXT_TOUCH_MRGHYST	15
#define MXT_TOUCH_MRGTHR	16
#define MXT_TOUCH_AMPHYST	17
#define MXT_TOUCH_XRANGE_LSB	18
#define MXT_TOUCH_XRANGE_MSB	19
#define MXT_TOUCH_YRANGE_LSB	20
#define MXT_TOUCH_YRANGE_MSB	21
#define MXT_TOUCH_XLOCLIP	22
#define MXT_TOUCH_XHICLIP	23
#define MXT_TOUCH_YLOCLIP	24
#define MXT_TOUCH_YHICLIP	25
#define MXT_TOUCH_XEDGECTRL	26
#define MXT_TOUCH_XEDGEDIST	27
#define MXT_TOUCH_YEDGECTRL	28
#define MXT_TOUCH_YEDGEDIST	29
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#define MXT_TOUCH_JUMPLIMIT	30
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/* MXT_PROCI_GRIPFACE_T20 field */
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#define MXT_GRIPFACE_CTRL	0
#define MXT_GRIPFACE_XLOGRIP	1
#define MXT_GRIPFACE_XHIGRIP	2
#define MXT_GRIPFACE_YLOGRIP	3
#define MXT_GRIPFACE_YHIGRIP	4
#define MXT_GRIPFACE_MAXTCHS	5
#define MXT_GRIPFACE_SZTHR1	7
#define MXT_GRIPFACE_SZTHR2	8
#define MXT_GRIPFACE_SHPTHR1	9
#define MXT_GRIPFACE_SHPTHR2	10
#define MXT_GRIPFACE_SUPEXTTO	11

/* MXT_PROCI_NOISE field */
#define MXT_NOISE_CTRL		0
#define MXT_NOISE_OUTFLEN	1
#define MXT_NOISE_GCAFUL_LSB	3
#define MXT_NOISE_GCAFUL_MSB	4
#define MXT_NOISE_GCAFLL_LSB	5
#define MXT_NOISE_GCAFLL_MSB	6
#define MXT_NOISE_ACTVGCAFVALID	7
#define MXT_NOISE_NOISETHR	8
#define MXT_NOISE_FREQHOPSCALE	10
#define MXT_NOISE_FREQ0		11
#define MXT_NOISE_FREQ1		12
#define MXT_NOISE_FREQ2		13
#define MXT_NOISE_FREQ3		14
#define MXT_NOISE_FREQ4		15
#define MXT_NOISE_IDLEGCAFVALID	16

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/* MXT_SPT_COMMSCONFIG_T18 */
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#define MXT_COMMS_CTRL		0
#define MXT_COMMS_CMD		1

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/* MXT_SPT_CTECONFIG_T28 field */
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#define MXT_CTE_CTRL		0
#define MXT_CTE_CMD		1
#define MXT_CTE_MODE		2
#define MXT_CTE_IDLEGCAFDEPTH	3
#define MXT_CTE_ACTVGCAFDEPTH	4
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#define MXT_CTE_VOLTAGE		5
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#define MXT_VOLTAGE_DEFAULT	2700000
#define MXT_VOLTAGE_STEP	10000

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/* Define for MXT_GEN_COMMAND_T6 */
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#define MXT_BOOT_VALUE		0xa5
#define MXT_BACKUP_VALUE	0x55
#define MXT_BACKUP_TIME		25	/* msec */
#define MXT_RESET_TIME		65	/* msec */

#define MXT_FWRESET_TIME	175	/* msec */
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/* Command to unlock bootloader */
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#define MXT_UNLOCK_CMD_MSB	0xaa
#define MXT_UNLOCK_CMD_LSB	0xdc
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/* Bootloader mode status */
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#define MXT_WAITING_BOOTLOAD_CMD	0xc0	/* valid 7 6 bit only */
#define MXT_WAITING_FRAME_DATA	0x80	/* valid 7 6 bit only */
#define MXT_FRAME_CRC_CHECK	0x02
#define MXT_FRAME_CRC_FAIL	0x03
#define MXT_FRAME_CRC_PASS	0x04
#define MXT_APP_CRC_FAIL	0x40	/* valid 7 8 bit only */
#define MXT_BOOT_STATUS_MASK	0x3f
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/* Touch status */
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#define MXT_UNGRIP		(1 << 0)
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#define MXT_SUPPRESS		(1 << 1)
#define MXT_AMP			(1 << 2)
#define MXT_VECTOR		(1 << 3)
#define MXT_MOVE		(1 << 4)
#define MXT_RELEASE		(1 << 5)
#define MXT_PRESS		(1 << 6)
#define MXT_DETECT		(1 << 7)
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/* Touch orient bits */
#define MXT_XY_SWITCH		(1 << 0)
#define MXT_X_INVERT		(1 << 1)
#define MXT_Y_INVERT		(1 << 2)

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/* Touchscreen absolute values */
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#define MXT_MAX_AREA		0xff
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struct mxt_info {
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	u8 family_id;
	u8 variant_id;
	u8 version;
	u8 build;
	u8 matrix_xsize;
	u8 matrix_ysize;
	u8 object_num;
};

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struct mxt_object {
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	u8 type;
	u16 start_address;
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	u8 size;		/* Size of each instance - 1 */
	u8 instances;		/* Number of instances - 1 */
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	u8 num_report_ids;
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} __packed;
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struct mxt_message {
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	u8 reportid;
	u8 message[7];
};

/* Each client has this additional data */
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struct mxt_data {
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	struct i2c_client *client;
	struct input_dev *input_dev;
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	char phys[64];		/* device physical location */
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	const struct mxt_platform_data *pdata;
	struct mxt_object *object_table;
	struct mxt_info info;
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	unsigned int irq;
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	unsigned int max_x;
	unsigned int max_y;
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	/* Cached parameters from object table */
	u8 T9_reportid_min;
	u8 T9_reportid_max;
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};

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static bool mxt_object_readable(unsigned int type)
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{
	switch (type) {
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	case MXT_GEN_COMMAND_T6:
	case MXT_GEN_POWER_T7:
	case MXT_GEN_ACQUIRE_T8:
	case MXT_GEN_DATASOURCE_T53:
	case MXT_TOUCH_MULTI_T9:
	case MXT_TOUCH_KEYARRAY_T15:
	case MXT_TOUCH_PROXIMITY_T23:
	case MXT_TOUCH_PROXKEY_T52:
	case MXT_PROCI_GRIPFACE_T20:
	case MXT_PROCG_NOISE_T22:
	case MXT_PROCI_ONETOUCH_T24:
	case MXT_PROCI_TWOTOUCH_T27:
	case MXT_PROCI_GRIP_T40:
	case MXT_PROCI_PALM_T41:
	case MXT_PROCI_TOUCHSUPPRESSION_T42:
	case MXT_PROCI_STYLUS_T47:
	case MXT_PROCG_NOISESUPPRESSION_T48:
	case MXT_SPT_COMMSCONFIG_T18:
	case MXT_SPT_GPIOPWM_T19:
	case MXT_SPT_SELFTEST_T25:
	case MXT_SPT_CTECONFIG_T28:
	case MXT_SPT_USERDATA_T38:
	case MXT_SPT_DIGITIZER_T43:
	case MXT_SPT_CTECONFIG_T46:
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		return true;
	default:
		return false;
	}
}

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static bool mxt_object_writable(unsigned int type)
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{
	switch (type) {
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	case MXT_GEN_COMMAND_T6:
	case MXT_GEN_POWER_T7:
	case MXT_GEN_ACQUIRE_T8:
	case MXT_TOUCH_MULTI_T9:
	case MXT_TOUCH_KEYARRAY_T15:
	case MXT_TOUCH_PROXIMITY_T23:
	case MXT_TOUCH_PROXKEY_T52:
	case MXT_PROCI_GRIPFACE_T20:
	case MXT_PROCG_NOISE_T22:
	case MXT_PROCI_ONETOUCH_T24:
	case MXT_PROCI_TWOTOUCH_T27:
	case MXT_PROCI_GRIP_T40:
	case MXT_PROCI_PALM_T41:
	case MXT_PROCI_TOUCHSUPPRESSION_T42:
	case MXT_PROCI_STYLUS_T47:
	case MXT_PROCG_NOISESUPPRESSION_T48:
	case MXT_SPT_COMMSCONFIG_T18:
	case MXT_SPT_GPIOPWM_T19:
	case MXT_SPT_SELFTEST_T25:
	case MXT_SPT_CTECONFIG_T28:
	case MXT_SPT_DIGITIZER_T43:
	case MXT_SPT_CTECONFIG_T46:
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		return true;
	default:
		return false;
	}
}

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static void mxt_dump_message(struct device *dev,
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			     struct mxt_message *message)
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{
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	dev_dbg(dev, "reportid: %u\tmessage: %02x %02x %02x %02x %02x %02x %02x\n",
		message->reportid, message->message[0], message->message[1],
		message->message[2], message->message[3], message->message[4],
		message->message[5], message->message[6]);
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}

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static int mxt_check_bootloader(struct i2c_client *client,
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				     unsigned int state)
{
	u8 val;

recheck:
	if (i2c_master_recv(client, &val, 1) != 1) {
		dev_err(&client->dev, "%s: i2c recv failed\n", __func__);
		return -EIO;
	}

	switch (state) {
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	case MXT_WAITING_BOOTLOAD_CMD:
	case MXT_WAITING_FRAME_DATA:
		val &= ~MXT_BOOT_STATUS_MASK;
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		break;
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	case MXT_FRAME_CRC_PASS:
		if (val == MXT_FRAME_CRC_CHECK)
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			goto recheck;
		break;
	default:
		return -EINVAL;
	}

	if (val != state) {
		dev_err(&client->dev, "Unvalid bootloader mode state\n");
		return -EINVAL;
	}

	return 0;
}

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static int mxt_unlock_bootloader(struct i2c_client *client)
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{
	u8 buf[2];

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	buf[0] = MXT_UNLOCK_CMD_LSB;
	buf[1] = MXT_UNLOCK_CMD_MSB;
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	if (i2c_master_send(client, buf, 2) != 2) {
		dev_err(&client->dev, "%s: i2c send failed\n", __func__);
		return -EIO;
	}

	return 0;
}

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static int mxt_fw_write(struct i2c_client *client,
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			     const u8 *data, unsigned int frame_size)
{
	if (i2c_master_send(client, data, frame_size) != frame_size) {
		dev_err(&client->dev, "%s: i2c send failed\n", __func__);
		return -EIO;
	}

	return 0;
}

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static int __mxt_read_reg(struct i2c_client *client,
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			       u16 reg, u16 len, void *val)
{
	struct i2c_msg xfer[2];
	u8 buf[2];
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	int ret;
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	buf[0] = reg & 0xff;
	buf[1] = (reg >> 8) & 0xff;

	/* Write register */
	xfer[0].addr = client->addr;
	xfer[0].flags = 0;
	xfer[0].len = 2;
	xfer[0].buf = buf;

	/* Read data */
	xfer[1].addr = client->addr;
	xfer[1].flags = I2C_M_RD;
	xfer[1].len = len;
	xfer[1].buf = val;

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	ret = i2c_transfer(client->adapter, xfer, 2);
	if (ret == 2) {
		ret = 0;
	} else {
		if (ret >= 0)
			ret = -EIO;
		dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
			__func__, ret);
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	}

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	return ret;
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}

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static int mxt_read_reg(struct i2c_client *client, u16 reg, u8 *val)
422
{
423
	return __mxt_read_reg(client, reg, 1, val);
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}

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static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
			   const void *val)
428
{
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	u8 *buf;
	size_t count;
431
	int ret;
432

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	count = len + 2;
	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

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	buf[0] = reg & 0xff;
	buf[1] = (reg >> 8) & 0xff;
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	memcpy(&buf[2], val, len);
441

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	ret = i2c_master_send(client, buf, count);
	if (ret == count) {
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		ret = 0;
	} else {
		if (ret >= 0)
			ret = -EIO;
		dev_err(&client->dev, "%s: i2c send failed (%d)\n",
			__func__, ret);
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	}

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	kfree(buf);
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	return ret;
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}

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static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
{
	return __mxt_write_reg(client, reg, 1, &val);
}

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static struct mxt_object *
mxt_get_object(struct mxt_data *data, u8 type)
463
{
464
	struct mxt_object *object;
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	int i;

	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;
		if (object->type == type)
			return object;
	}

	dev_err(&data->client->dev, "Invalid object type\n");
	return NULL;
}

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static int mxt_read_message(struct mxt_data *data,
				 struct mxt_message *message)
479
{
480
	struct mxt_object *object;
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	u16 reg;

483
	object = mxt_get_object(data, MXT_GEN_MESSAGE_T5);
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	if (!object)
		return -EINVAL;

	reg = object->start_address;
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	return __mxt_read_reg(data->client, reg,
			sizeof(struct mxt_message), message);
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}

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static int mxt_write_object(struct mxt_data *data,
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				 u8 type, u8 offset, u8 val)
{
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	struct mxt_object *object;
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	u16 reg;

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	object = mxt_get_object(data, type);
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	if (!object || offset >= object->size + 1)
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		return -EINVAL;

	reg = object->start_address;
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	return mxt_write_reg(data->client, reg + offset, val);
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}

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static void mxt_input_touchevent(struct mxt_data *data,
				      struct mxt_message *message, int id)
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{
	struct device *dev = &data->client->dev;
	u8 status = message->message[0];
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	struct input_dev *input_dev = data->input_dev;
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	int x;
	int y;
	int area;
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	int pressure;
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	x = (message->message[1] << 4) | ((message->message[3] >> 4) & 0xf);
	y = (message->message[2] << 4) | ((message->message[3] & 0xf));
	if (data->max_x < 1024)
		x = x >> 2;
	if (data->max_y < 1024)
		y = y >> 2;

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	area = message->message[4];
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	pressure = message->message[5];
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	dev_dbg(dev,
		"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
		id,
		(status & MXT_DETECT) ? 'D' : '.',
		(status & MXT_PRESS) ? 'P' : '.',
		(status & MXT_RELEASE) ? 'R' : '.',
		(status & MXT_MOVE) ? 'M' : '.',
		(status & MXT_VECTOR) ? 'V' : '.',
		(status & MXT_AMP) ? 'A' : '.',
		(status & MXT_SUPPRESS) ? 'S' : '.',
		(status & MXT_UNGRIP) ? 'U' : '.',
		x, y, area, pressure);

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	input_mt_slot(input_dev, id);
	input_mt_report_slot_state(input_dev, MT_TOOL_FINGER,
				   status & MXT_DETECT);

	if (status & MXT_DETECT) {
		input_report_abs(input_dev, ABS_MT_POSITION_X, x);
		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
		input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
	}
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	input_mt_report_pointer_emulation(input_dev, false);
	input_sync(input_dev);
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}

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static bool mxt_is_T9_message(struct mxt_data *data, struct mxt_message *msg)
{
	u8 id = msg->reportid;
	return (id >= data->T9_reportid_min && id <= data->T9_reportid_max);
}

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static irqreturn_t mxt_interrupt(int irq, void *dev_id)
562
{
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	struct mxt_data *data = dev_id;
	struct mxt_message message;
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	struct device *dev = &data->client->dev;
	int id;
	u8 reportid;

	do {
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		if (mxt_read_message(data, &message)) {
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			dev_err(dev, "Failed to read message\n");
			goto end;
		}

		reportid = message.reportid;

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		id = reportid - data->T9_reportid_min;
578

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		if (mxt_is_T9_message(data, &message))
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			mxt_input_touchevent(data, &message, id);
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		else
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			mxt_dump_message(dev, &message);
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	} while (reportid != 0xff);

end:
	return IRQ_HANDLED;
}

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static int mxt_check_reg_init(struct mxt_data *data)
590
{
591
	const struct mxt_platform_data *pdata = data->pdata;
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	struct mxt_object *object;
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	struct device *dev = &data->client->dev;
	int index = 0;
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	int i, size;
	int ret;
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	if (!pdata->config) {
		dev_dbg(dev, "No cfg data defined, skipping reg init\n");
		return 0;
601 602 603 604 605
	}

	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;

606
		if (!mxt_object_writable(object->type))
607 608
			continue;

609 610 611 612
		size = (object->size + 1) * (object->instances + 1);
		if (index + size > pdata->config_length) {
			dev_err(dev, "Not enough config data!\n");
			return -EINVAL;
613
		}
614 615 616 617 618 619

		ret = __mxt_write_reg(data->client, object->start_address,
				size, &pdata->config[index]);
		if (ret)
			return ret;
		index += size;
620 621 622 623 624
	}

	return 0;
}

625
static int mxt_make_highchg(struct mxt_data *data)
626 627
{
	struct device *dev = &data->client->dev;
628
	struct mxt_message message;
629 630 631 632 633
	int count = 10;
	int error;

	/* Read dummy message to make high CHG pin */
	do {
634
		error = mxt_read_message(data, &message);
635 636
		if (error)
			return error;
637
	} while (message.reportid != 0xff && --count);
638 639 640 641 642 643 644 645 646

	if (!count) {
		dev_err(dev, "CHG pin isn't cleared\n");
		return -EBUSY;
	}

	return 0;
}

647
static void mxt_handle_pdata(struct mxt_data *data)
648
{
649
	const struct mxt_platform_data *pdata = data->pdata;
650 651 652
	u8 voltage;

	/* Set touchscreen lines */
653
	mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_XSIZE,
654
			pdata->x_line);
655
	mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_YSIZE,
656 657 658
			pdata->y_line);

	/* Set touchscreen orient */
659
	mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_ORIENT,
660 661 662
			pdata->orient);

	/* Set touchscreen burst length */
663
	mxt_write_object(data, MXT_TOUCH_MULTI_T9,
664
			MXT_TOUCH_BLEN, pdata->blen);
665 666

	/* Set touchscreen threshold */
667
	mxt_write_object(data, MXT_TOUCH_MULTI_T9,
668
			MXT_TOUCH_TCHTHR, pdata->threshold);
669 670

	/* Set touchscreen resolution */
671
	mxt_write_object(data, MXT_TOUCH_MULTI_T9,
672
			MXT_TOUCH_XRANGE_LSB, (pdata->x_size - 1) & 0xff);
673
	mxt_write_object(data, MXT_TOUCH_MULTI_T9,
674
			MXT_TOUCH_XRANGE_MSB, (pdata->x_size - 1) >> 8);
675
	mxt_write_object(data, MXT_TOUCH_MULTI_T9,
676
			MXT_TOUCH_YRANGE_LSB, (pdata->y_size - 1) & 0xff);
677
	mxt_write_object(data, MXT_TOUCH_MULTI_T9,
678
			MXT_TOUCH_YRANGE_MSB, (pdata->y_size - 1) >> 8);
679 680

	/* Set touchscreen voltage */
681
	if (pdata->voltage) {
682 683 684
		if (pdata->voltage < MXT_VOLTAGE_DEFAULT) {
			voltage = (MXT_VOLTAGE_DEFAULT - pdata->voltage) /
				MXT_VOLTAGE_STEP;
685 686
			voltage = 0xff - voltage + 1;
		} else
687 688
			voltage = (pdata->voltage - MXT_VOLTAGE_DEFAULT) /
				MXT_VOLTAGE_STEP;
689

690
		mxt_write_object(data, MXT_SPT_CTECONFIG_T28,
691
				MXT_CTE_VOLTAGE, voltage);
692 693 694
	}
}

695
static int mxt_get_info(struct mxt_data *data)
696 697
{
	struct i2c_client *client = data->client;
698
	struct mxt_info *info = &data->info;
699 700
	int error;

701 702
	/* Read 7-byte info block starting at address 0 */
	error = __mxt_read_reg(client, MXT_INFO, sizeof(*info), info);
703 704 705 706 707 708
	if (error)
		return error;

	return 0;
}

709
static int mxt_get_object_table(struct mxt_data *data)
710
{
711 712
	struct i2c_client *client = data->client;
	size_t table_size;
713 714
	int error;
	int i;
715 716 717 718 719 720 721
	u8 reportid;

	table_size = data->info.object_num * sizeof(struct mxt_object);
	error = __mxt_read_reg(client, MXT_OBJECT_START, table_size,
			data->object_table);
	if (error)
		return error;
722

723 724
	/* Valid Report IDs start counting from 1 */
	reportid = 1;
725
	for (i = 0; i < data->info.object_num; i++) {
726
		struct mxt_object *object = data->object_table + i;
727
		u8 min_id, max_id;
728

729
		le16_to_cpus(&object->start_address);
730 731

		if (object->num_report_ids) {
732
			min_id = reportid;
733 734
			reportid += object->num_report_ids *
					(object->instances + 1);
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
			max_id = reportid - 1;
		} else {
			min_id = 0;
			max_id = 0;
		}

		dev_dbg(&data->client->dev,
			"Type %2d Start %3d Size %3d Instances %2d ReportIDs %3u : %3u\n",
			object->type, object->start_address, object->size + 1,
			object->instances + 1, min_id, max_id);

		switch (object->type) {
		case MXT_TOUCH_MULTI_T9:
			data->T9_reportid_min = min_id;
			data->T9_reportid_max = max_id;
			break;
751 752 753 754 755 756
		}
	}

	return 0;
}

757 758 759 760
static void mxt_free_object_table(struct mxt_data *data)
{
	kfree(data->object_table);
	data->object_table = NULL;
761 762
	data->T9_reportid_min = 0;
	data->T9_reportid_max = 0;
763 764
}

765
static int mxt_initialize(struct mxt_data *data)
766 767
{
	struct i2c_client *client = data->client;
768
	struct mxt_info *info = &data->info;
769 770 771
	int error;
	u8 val;

772
	error = mxt_get_info(data);
773 774 775 776
	if (error)
		return error;

	data->object_table = kcalloc(info->object_num,
777
				     sizeof(struct mxt_object),
778 779 780 781 782 783 784
				     GFP_KERNEL);
	if (!data->object_table) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		return -ENOMEM;
	}

	/* Get object table information */
785
	error = mxt_get_object_table(data);
786
	if (error)
787
		goto err_free_object_table;
788 789

	/* Check register init values */
790
	error = mxt_check_reg_init(data);
791
	if (error)
792
		goto err_free_object_table;
793

794
	mxt_handle_pdata(data);
795 796

	/* Backup to memory */
797
	mxt_write_object(data, MXT_GEN_COMMAND_T6,
798 799 800
			MXT_COMMAND_BACKUPNV,
			MXT_BACKUP_VALUE);
	msleep(MXT_BACKUP_TIME);
801 802

	/* Soft reset */
803
	mxt_write_object(data, MXT_GEN_COMMAND_T6,
804 805
			MXT_COMMAND_RESET, 1);
	msleep(MXT_RESET_TIME);
806 807

	/* Update matrix size at info struct */
808
	error = mxt_read_reg(client, MXT_MATRIX_X_SIZE, &val);
809
	if (error)
810
		goto err_free_object_table;
811 812
	info->matrix_xsize = val;

813
	error = mxt_read_reg(client, MXT_MATRIX_Y_SIZE, &val);
814
	if (error)
815
		goto err_free_object_table;
816 817 818
	info->matrix_ysize = val;

	dev_info(&client->dev,
819 820 821
			"Family ID: %u Variant ID: %u Major.Minor.Build: %u.%u.%02X\n",
			info->family_id, info->variant_id, info->version >> 4,
			info->version & 0xf, info->build);
822 823

	dev_info(&client->dev,
824
			"Matrix X Size: %u Matrix Y Size: %u Object Num: %u\n",
825 826 827 828
			info->matrix_xsize, info->matrix_ysize,
			info->object_num);

	return 0;
829 830 831 832

err_free_object_table:
	mxt_free_object_table(data);
	return error;
833 834
}

835 836 837 838 839 840 841 842 843 844 845 846 847 848
static void mxt_calc_resolution(struct mxt_data *data)
{
	unsigned int max_x = data->pdata->x_size - 1;
	unsigned int max_y = data->pdata->y_size - 1;

	if (data->pdata->orient & MXT_XY_SWITCH) {
		data->max_x = max_y;
		data->max_y = max_x;
	} else {
		data->max_x = max_x;
		data->max_y = max_y;
	}
}

849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
/* Firmware Version is returned as Major.Minor.Build */
static ssize_t mxt_fw_version_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	struct mxt_info *info = &data->info;
	return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n",
			 info->version >> 4, info->version & 0xf, info->build);
}

/* Hardware Version is returned as FamilyID.VariantID */
static ssize_t mxt_hw_version_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct mxt_data *data = dev_get_drvdata(dev);
	struct mxt_info *info = &data->info;
	return scnprintf(buf, PAGE_SIZE, "%u.%u\n",
			 info->family_id, info->variant_id);
}

869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
static ssize_t mxt_show_instance(char *buf, int count,
				 struct mxt_object *object, int instance,
				 const u8 *val)
{
	int i;

	if (object->instances > 0)
		count += scnprintf(buf + count, PAGE_SIZE - count,
				   "Instance %u\n", instance);

	for (i = 0; i < object->size + 1; i++)
		count += scnprintf(buf + count, PAGE_SIZE - count,
				"\t[%2u]: %02x (%d)\n", i, val[i], val[i]);
	count += scnprintf(buf + count, PAGE_SIZE - count, "\n");

	return count;
}

887
static ssize_t mxt_object_show(struct device *dev,
888 889
				    struct device_attribute *attr, char *buf)
{
890 891
	struct mxt_data *data = dev_get_drvdata(dev);
	struct mxt_object *object;
892 893 894
	int count = 0;
	int i, j;
	int error;
895 896 897 898 899 900
	u8 *obuf;

	/* Pre-allocate buffer large enough to hold max sized object. */
	obuf = kmalloc(256, GFP_KERNEL);
	if (!obuf)
		return -ENOMEM;
901

902
	error = 0;
903 904 905
	for (i = 0; i < data->info.object_num; i++) {
		object = data->object_table + i;

906
		if (!mxt_object_readable(object->type))
907
			continue;
908 909 910

		count += scnprintf(buf + count, PAGE_SIZE - count,
				"T%u:\n", object->type);
911

912 913 914
		for (j = 0; j < object->instances + 1; j++) {
			u16 size = object->size + 1;
			u16 addr = object->start_address + j * size;
915

916 917 918
			error = __mxt_read_reg(data->client, addr, size, obuf);
			if (error)
				goto done;
919

920
			count = mxt_show_instance(buf, count, object, j, obuf);
921 922 923
		}
	}

924
done:
925 926
	kfree(obuf);
	return error ?: count;
927 928
}

929
static int mxt_load_fw(struct device *dev, const char *fn)
930
{
931
	struct mxt_data *data = dev_get_drvdata(dev);
932 933 934 935 936 937 938 939 940 941 942 943 944
	struct i2c_client *client = data->client;
	const struct firmware *fw = NULL;
	unsigned int frame_size;
	unsigned int pos = 0;
	int ret;

	ret = request_firmware(&fw, fn, dev);
	if (ret) {
		dev_err(dev, "Unable to open firmware %s\n", fn);
		return ret;
	}

	/* Change to the bootloader mode */
945
	mxt_write_object(data, MXT_GEN_COMMAND_T6,
946 947
			MXT_COMMAND_RESET, MXT_BOOT_VALUE);
	msleep(MXT_RESET_TIME);
948 949

	/* Change to slave address of bootloader */
950 951
	if (client->addr == MXT_APP_LOW)
		client->addr = MXT_BOOT_LOW;
952
	else
953
		client->addr = MXT_BOOT_HIGH;
954

955
	ret = mxt_check_bootloader(client, MXT_WAITING_BOOTLOAD_CMD);
956 957 958 959
	if (ret)
		goto out;

	/* Unlock bootloader */
960
	mxt_unlock_bootloader(client);
961 962

	while (pos < fw->size) {
963 964
		ret = mxt_check_bootloader(client,
						MXT_WAITING_FRAME_DATA);
965 966 967 968 969 970 971 972 973 974 975
		if (ret)
			goto out;

		frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));

		/* We should add 2 at frame size as the the firmware data is not
		 * included the CRC bytes.
		 */
		frame_size += 2;

		/* Write one frame to device */
976
		mxt_fw_write(client, fw->data + pos, frame_size);
977

978 979
		ret = mxt_check_bootloader(client,
						MXT_FRAME_CRC_PASS);
980 981 982 983 984 985 986 987 988 989 990 991
		if (ret)
			goto out;

		pos += frame_size;

		dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size);
	}

out:
	release_firmware(fw);

	/* Change to slave address of application */
992 993
	if (client->addr == MXT_BOOT_LOW)
		client->addr = MXT_APP_LOW;
994
	else
995
		client->addr = MXT_APP_HIGH;
996 997 998 999

	return ret;
}

1000
static ssize_t mxt_update_fw_store(struct device *dev,
1001 1002 1003
					struct device_attribute *attr,
					const char *buf, size_t count)
{
1004
	struct mxt_data *data = dev_get_drvdata(dev);
1005 1006 1007 1008
	int error;

	disable_irq(data->irq);

1009
	error = mxt_load_fw(dev, MXT_FW_NAME);
1010 1011 1012 1013 1014 1015 1016
	if (error) {
		dev_err(dev, "The firmware update failed(%d)\n", error);
		count = error;
	} else {
		dev_dbg(dev, "The firmware update succeeded\n");

		/* Wait for reset */
1017
		msleep(MXT_FWRESET_TIME);
1018

1019
		mxt_free_object_table(data);
1020

1021
		mxt_initialize(data);
1022 1023 1024 1025
	}

	enable_irq(data->irq);

1026 1027 1028 1029
	error = mxt_make_highchg(data);
	if (error)
		return error;

1030 1031 1032
	return count;
}

1033 1034
static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
1035 1036
static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
1037

1038
static struct attribute *mxt_attrs[] = {
1039 1040
	&dev_attr_fw_version.attr,
	&dev_attr_hw_version.attr,
1041 1042 1043 1044 1045
	&dev_attr_object.attr,
	&dev_attr_update_fw.attr,
	NULL
};

1046 1047
static const struct attribute_group mxt_attr_group = {
	.attrs = mxt_attrs,
1048 1049
};

1050
static void mxt_start(struct mxt_data *data)
1051 1052
{
	/* Touch enable */
1053
	mxt_write_object(data,
1054
			MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, 0x83);
1055 1056
}

1057
static void mxt_stop(struct mxt_data *data)
1058 1059
{
	/* Touch disable */
1060
	mxt_write_object(data,
1061
			MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, 0);
1062 1063
}

1064
static int mxt_input_open(struct input_dev *dev)
1065
{
1066
	struct mxt_data *data = input_get_drvdata(dev);
1067

1068
	mxt_start(data);
1069 1070 1071 1072

	return 0;
}

1073
static void mxt_input_close(struct input_dev *dev)
1074
{
1075
	struct mxt_data *data = input_get_drvdata(dev);
1076

1077
	mxt_stop(data);
1078 1079
}

1080
static int __devinit mxt_probe(struct i2c_client *client,
1081 1082
		const struct i2c_device_id *id)
{
1083
	const struct mxt_platform_data *pdata = client->dev.platform_data;
1084
	struct mxt_data *data;
1085 1086
	struct input_dev *input_dev;
	int error;
1087
	unsigned int num_mt_slots;
1088

1089
	if (!pdata)
1090 1091
		return -EINVAL;

1092
	data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
1093 1094 1095 1096 1097 1098 1099
	input_dev = input_allocate_device();
	if (!data || !input_dev) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

1100
	input_dev->name = "Atmel maXTouch Touchscreen";
1101 1102 1103 1104
	snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
		 client->adapter->nr, client->addr);
	input_dev->phys = data->phys;

1105 1106
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;
1107 1108
	input_dev->open = mxt_input_open;
	input_dev->close = mxt_input_close;
1109

1110 1111 1112 1113 1114 1115 1116
	data->client = client;
	data->input_dev = input_dev;
	data->pdata = pdata;
	data->irq = client->irq;

	mxt_calc_resolution(data);

1117 1118 1119 1120
	error = mxt_initialize(data);
	if (error)
		goto err_free_mem;

1121 1122 1123 1124 1125 1126
	__set_bit(EV_ABS, input_dev->evbit);
	__set_bit(EV_KEY, input_dev->evbit);
	__set_bit(BTN_TOUCH, input_dev->keybit);

	/* For single touch */
	input_set_abs_params(input_dev, ABS_X,
1127
			     0, data->max_x, 0, 0);
1128
	input_set_abs_params(input_dev, ABS_Y,
1129
			     0, data->max_y, 0, 0);
1130 1131
	input_set_abs_params(input_dev, ABS_PRESSURE,
			     0, 255, 0, 0);
1132 1133

	/* For multi touch */
1134 1135
	num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
	error = input_mt_init_slots(input_dev, num_mt_slots);
1136
	if (error)
1137
		goto err_free_object;
1138
	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
1139
			     0, MXT_MAX_AREA, 0, 0);
1140
	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
1141
			     0, data->max_x, 0, 0);
1142
	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
1143
			     0, data->max_y, 0, 0);
1144 1145
	input_set_abs_params(input_dev, ABS_MT_PRESSURE,
			     0, 255, 0, 0);
1146 1147 1148 1149

	input_set_drvdata(input_dev, data);
	i2c_set_clientdata(client, data);

1150
	error = request_threaded_irq(client->irq, NULL, mxt_interrupt,
1151
			pdata->irqflags, client->name, data);
1152 1153 1154 1155 1156
	if (error) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		goto err_free_object;
	}

1157 1158 1159 1160
	error = mxt_make_highchg(data);
	if (error)
		goto err_free_irq;

1161 1162 1163 1164
	error = input_register_device(input_dev);
	if (error)
		goto err_free_irq;

1165
	error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
1166
	if (error)
1167
		dev_warn(&client->dev, "error creating sysfs entries.\n");
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180

	return 0;

err_free_irq:
	free_irq(client->irq, data);
err_free_object:
	kfree(data->object_table);
err_free_mem:
	input_free_device(input_dev);
	kfree(data);
	return error;
}

1181
static int __devexit mxt_remove(struct i2c_client *client)
1182
{
1183
	struct mxt_data *data = i2c_get_clientdata(client);
1184

1185
	sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
1186 1187 1188 1189 1190 1191 1192 1193
	free_irq(data->irq, data);
	input_unregister_device(data->input_dev);
	kfree(data->object_table);
	kfree(data);

	return 0;
}

1194
#ifdef CONFIG_PM_SLEEP
1195
static int mxt_suspend(struct device *dev)
1196
{
1197
	struct i2c_client *client = to_i2c_client(dev);
1198
	struct mxt_data *data = i2c_get_clientdata(client);
1199 1200 1201 1202 1203
	struct input_dev *input_dev = data->input_dev;

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
1204
		mxt_stop(data);
1205 1206 1207 1208 1209 1210

	mutex_unlock(&input_dev->mutex);

	return 0;
}

1211
static int mxt_resume(struct device *dev)
1212
{
1213
	struct i2c_client *client = to_i2c_client(dev);
1214
	struct mxt_data *data = i2c_get_clientdata(client);
1215 1216 1217
	struct input_dev *input_dev = data->input_dev;

	/* Soft reset */
1218
	mxt_write_object(data, MXT_GEN_COMMAND_T6,
1219
			MXT_COMMAND_RESET, 1);
1220

1221
	msleep(MXT_RESET_TIME);
1222 1223 1224 1225

	mutex_lock(&input_dev->mutex);

	if (input_dev->users)
1226
		mxt_start(data);
1227 1228 1229 1230 1231 1232 1233

	mutex_unlock(&input_dev->mutex);

	return 0;
}
#endif

1234 1235
static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);

1236
static const struct i2c_device_id mxt_id[] = {
1237
	{ "qt602240_ts", 0 },
1238
	{ "atmel_mxt_ts", 0 },
1239
	{ "mXT224", 0 },
1240 1241
	{ }
};
1242
MODULE_DEVICE_TABLE(i2c, mxt_id);
1243

1244
static struct i2c_driver mxt_driver = {
1245
	.driver = {
1246
		.name	= "atmel_mxt_ts",
1247
		.owner	= THIS_MODULE,
1248
		.pm	= &mxt_pm_ops,
1249
	},
1250 1251 1252
	.probe		= mxt_probe,
	.remove		= __devexit_p(mxt_remove),
	.id_table	= mxt_id,
1253 1254
};

1255
module_i2c_driver(mxt_driver);
1256 1257 1258

/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
1259
MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
1260
MODULE_LICENSE("GPL");