[v4 1/3] 1/3 Touchscreen: Cypress TTSP G3 Core Driver

[Kevin McNeely]

Cypress TTSP Gen3 Core Driver.
Core Driver includes platform data definition file,
core driver definition file, and core touchscreen
touch handling of device data. Generates
multi-touch input events.

Signed-off-by: Kevin McNeely <kev@xxxxxxxxxxx>
---
Changes since v3:
- Removed unused items
- replace EIO with EINVAL
- add x[], y[] and loop on mt signaling
- removed uninitialized use of ts->dev

 drivers/input/touchscreen/Kconfig       |    5 +
 drivers/input/touchscreen/Makefile      |    1 +
 drivers/input/touchscreen/cyttsp_core.c |  794 +++++++++++++++++++++++++++++++
 drivers/input/touchscreen/cyttsp_core.h |   55 +++
 include/linux/input/cyttsp.h            |   68 +++
 5 files changed, 923 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/touchscreen/cyttsp_core.c
 create mode 100644 drivers/input/touchscreen/cyttsp_core.h
 create mode 100644 include/linux/input/cyttsp.h

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 06ea8da..c3240b8 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -124,6 +124,11 @@ config TOUCHSCREEN_CY8CTMG110
 	  To compile this driver as a module, choose M here: the
 	  module will be called cy8ctmg110_ts.
 
+config TOUCHSCREEN_CYTTSP_CORE
+	tristate "Cypress TTSP touchscreen core"
+	help
+	  Always activated for Cypress TTSP touchscreen
+
 config TOUCHSCREEN_DA9034
 	tristate "Touchscreen support for Dialog Semiconductor DA9034"
 	depends on PMIC_DA903X
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 7cc1b4f..b6f1ba8 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC)	+= atmel_tsadcc.o
 obj-$(CONFIG_TOUCHSCREEN_BITSY)		+= h3600_ts_input.o
 obj-$(CONFIG_TOUCHSCREEN_BU21013)       += bu21013_ts.o
 obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110)	+= cy8ctmg110_ts.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE)   += cyttsp_core.o
 obj-$(CONFIG_TOUCHSCREEN_DA9034)	+= da9034-ts.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)	+= dynapro.o
 obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)	+= hampshire.o
diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
new file mode 100644
index 0000000..07b4840
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -0,0 +1,794 @@
+/*
+ * Core Source for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <kev@xxxxxxxxxxx>
+ *
+ */
+
+#include "cyttsp_core.h"
+
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+/* Bootloader number of command keys */
+#define CY_NUM_BL_KEYS    8
+
+/* helpers */
+#define GET_NUM_TOUCHES(x)          ((x) & 0x0F)
+#define IS_LARGE_AREA(x)            (((x) & 0x10) >> 4)
+#define IS_BAD_PKT(x)               ((x) & 0x20)
+#define IS_VALID_APP(x)             ((x) & 0x01)
+#define IS_OPERATIONAL_ERR(x)       ((x) & 0x3F)
+#define GET_HSTMODE(reg)            ((reg & 0x70) >> 4)
+#define GET_BOOTLOADERMODE(reg)     ((reg & 0x10) >> 4)
+
+#define CY_REG_BASE                 0x00
+#define CY_REG_ACT_DIST             0x1E
+#define CY_REG_ACT_INTRVL           0x1D
+#define CY_REG_TCH_TMOUT            (CY_REG_ACT_INTRVL+1)
+#define CY_REG_LP_INTRVL            (CY_REG_TCH_TMOUT+1)
+#define CY_MAXZ                     255
+#define CY_DELAY_DFLT               20 /* ms */
+#define CY_DELAY_MAX                (500/CY_DELAY_DFLT) /* half second */
+#define CY_ACT_DIST_DFLT            0xF8
+#define CY_HNDSHK_BIT               0x80
+/* device mode bits */
+#define CY_OPERATE_MODE             0x00
+#define CY_SYSINFO_MODE             0x10
+/* power mode select bits */
+#define CY_SOFT_RESET_MODE          0x01 /* return to Bootloader mode */
+#define CY_DEEP_SLEEP_MODE          0x02
+#define CY_LOW_POWER_MODE           0x04
+
+/* TrueTouch Standard Product Gen3 interface definition */
+struct cyttsp_xydata {
+	u8 hst_mode;
+	u8 tt_mode;
+	u8 tt_stat;
+	u8 tch1_xhi;
+	u8 tch1_xlo;
+	u8 tch1_yhi;
+	u8 tch1_ylo;
+	u8 tch1_z;
+	u8 unused;
+	u8 tch2_xhi;
+	u8 tch2_xlo;
+	u8 tch2_yhi;
+	u8 tch2_ylo;
+	u8 tch2_z;
+	u8 unused_grp[13];
+	u8 tt_undef[3];
+	u8 act_dist;
+	u8 tt_reserved;
+};
+
+/* TTSP System Information interface definition */
+struct cyttsp_sysinfo_data {
+	u8 hst_mode;
+	u8 mfg_cmd;
+	u8 mfg_stat;
+	u8 cid[3];
+	u8 tt_undef1;
+	u8 uid[8];
+	u8 bl_verh;
+	u8 bl_verl;
+	u8 tts_verh;
+	u8 tts_verl;
+	u8 app_idh;
+	u8 app_idl;
+	u8 app_verh;
+	u8 app_verl;
+	u8 tt_undef[5];
+	u8 scn_typ;
+	u8 act_intrvl;
+	u8 tch_tmout;
+	u8 lp_intrvl;
+};
+
+/* TTSP Bootloader Register Map interface definition */
+#define CY_BL_CHKSUM_OK 0x01
+struct cyttsp_bootloader_data {
+	u8 bl_file;
+	u8 bl_status;
+	u8 bl_error;
+	u8 blver_hi;
+	u8 blver_lo;
+	u8 bld_blver_hi;
+	u8 bld_blver_lo;
+	u8 ttspver_hi;
+	u8 ttspver_lo;
+	u8 appid_hi;
+	u8 appid_lo;
+	u8 appver_hi;
+	u8 appver_lo;
+	u8 cid_0;
+	u8 cid_1;
+	u8 cid_2;
+};
+
+struct cyttsp {
+	struct device *dev;
+	int irq;
+	struct input_dev *input;
+	char phys[32];
+	const struct bus_type *bus_type;
+	const struct cyttsp_platform_data *platform_data;
+	struct cyttsp_bus_ops *bus_ops;
+	struct cyttsp_xydata xy_data;
+	struct cyttsp_bootloader_data bl_data;
+	struct cyttsp_sysinfo_data sysinfo_data;
+	struct completion bl_ready;
+	enum cyttsp_powerstate power_state;
+};
+
+static const u8 bl_command[] = {
+	0x00,			/* file offset */
+	0xFF,			/* command */
+	0xA5,			/* exit bootloader command */
+	0, 1, 2, 3, 4, 5, 6, 7	/* default keys */
+};
+
+static int ttsp_read_block_data(struct cyttsp *ts, u8 command,
+	u8 length, void *buf)
+{
+	int retval;
+	int tries;
+
+	if (!buf || !length)
+		return -EINVAL;
+
+	for (tries = 0, retval = -1;
+		tries < CY_NUM_RETRY && (retval < 0);
+		tries++)
+		retval = ts->bus_ops->read(ts->bus_ops, command, length, buf);
+
+	return retval;
+}
+
+static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
+	u8 length, void *buf)
+{
+	int retval;
+	if (!buf || !length)
+		return -EINVAL;
+
+	retval = ts->bus_ops->write(ts->bus_ops, command, length, buf);
+
+	return retval;
+}
+
+static int ttsp_tch_ext(struct cyttsp *ts, void *buf)
+{
+	int retval;
+
+	if (!buf)
+		return -EIO;
+
+	retval = ts->bus_ops->ext(ts->bus_ops, buf);
+
+	return retval;
+}
+
+static int cyttsp_load_bl_regs(struct cyttsp *ts)
+{
+	int retval;
+
+	memset(&(ts->bl_data), 0, sizeof(struct cyttsp_bootloader_data));
+
+	retval =  ttsp_read_block_data(ts, CY_REG_BASE,
+		sizeof(ts->bl_data), &(ts->bl_data));
+
+	return retval;
+}
+
+static int cyttsp_bl_app_valid(struct cyttsp *ts)
+{
+	int retval;
+
+	retval = cyttsp_load_bl_regs(ts);
+
+	if (retval < 0)
+		return -ENODEV;
+
+	if (GET_BOOTLOADERMODE(ts->bl_data.bl_status)) {
+		if (IS_VALID_APP(ts->bl_data.bl_status)) {
+			dev_dbg(ts->dev, "%s: App found; normal boot\n",
+				__func__);
+			return 0;
+		} else {
+			dev_dbg(ts->dev, "%s: NO APP; load firmware!!\n",
+				__func__);
+			return -ENODEV;
+		}
+	} else if (GET_HSTMODE(ts->bl_data.bl_file) == CY_OPERATE_MODE) {
+		if (!(IS_OPERATIONAL_ERR(ts->bl_data.bl_status))) {
+			dev_dbg(ts->dev, "%s: Operational\n",
+				__func__);
+			return 1;
+		} else {
+			dev_dbg(ts->dev, "%s: Operational failure\n",
+				__func__);
+			return -ENODEV;
+		}
+	} else {
+		dev_dbg(ts->dev, "%s: Non-Operational failure\n",
+			__func__);
+			return -ENODEV;
+	}
+
+}
+
+static int cyttsp_exit_bl_mode(struct cyttsp *ts)
+{
+	int retval;
+	int tries;
+	u8 bl_cmd[sizeof(bl_command)];
+
+	memcpy(bl_cmd, bl_command, sizeof(bl_command));
+	if (ts->platform_data->bl_keys)
+		memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
+			ts->platform_data->bl_keys, sizeof(bl_command));
+
+	dev_dbg(ts->dev,
+		"%s: bl_cmd= "
+		"%02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n",
+		__func__, bl_cmd[0], bl_cmd[1], bl_cmd[2],
+		bl_cmd[3], bl_cmd[4], bl_cmd[5], bl_cmd[6],
+		bl_cmd[7], bl_cmd[8], bl_cmd[9], bl_cmd[10]);
+
+	retval = ttsp_write_block_data(ts, CY_REG_BASE,
+		sizeof(bl_cmd), (void *)bl_cmd);
+	if (retval < 0)
+		return retval;
+
+	/* wait for TTSP Device to complete switch to Operational mode */
+	tries = 0;
+	do {
+		msleep(CY_DELAY_DFLT);
+		retval = cyttsp_load_bl_regs(ts);
+	} while (!((retval == 0) &&
+		!GET_BOOTLOADERMODE(ts->bl_data.bl_status)) &&
+		(tries++ < CY_DELAY_MAX));
+
+	dev_dbg(ts->dev, "%s: check bl ready tries=%d ret=%d stat=%02X\n",
+		__func__, tries, retval, ts->bl_data.bl_status);
+
+	if (retval < 0)
+		return retval;
+	else if (GET_BOOTLOADERMODE(ts->bl_data.bl_status))
+		return -ENODEV;
+	else
+		return 0;
+}
+
+static int cyttsp_set_operational_mode(struct cyttsp *ts)
+{
+	int retval;
+	int tries;
+	u8 cmd = CY_OPERATE_MODE;
+
+	retval = ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
+
+	if (retval < 0)
+		return retval;
+
+	/* wait for TTSP Device to complete switch to Operational mode */
+	tries = 0;
+	do {
+		msleep(CY_DELAY_DFLT);
+		retval = ttsp_read_block_data(ts, CY_REG_BASE,
+			sizeof(ts->xy_data), &(ts->xy_data));
+	} while (!((retval == 0) &&
+		(ts->xy_data.act_dist == CY_ACT_DIST_DFLT)) &&
+		(tries++ < CY_DELAY_MAX));
+
+	dev_dbg(ts->dev, "%s: check op ready tries=%d ret=%d dist=%02X\n",
+		__func__, tries, retval, ts->xy_data.act_dist);
+
+	return retval;
+}
+
+static int cyttsp_set_sysinfo_mode(struct cyttsp *ts)
+{
+	int retval;
+	int tries;
+	u8 cmd = CY_SYSINFO_MODE;
+
+	memset(&(ts->sysinfo_data), 0, sizeof(struct cyttsp_sysinfo_data));
+
+	/* switch to sysinfo mode */
+	retval = ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
+	if (retval < 0)
+		return retval;
+
+	/* read sysinfo registers */
+	tries = 0;
+	do {
+		msleep(CY_DELAY_DFLT);
+		retval = ttsp_read_block_data(ts, CY_REG_BASE,
+			sizeof(ts->sysinfo_data), &(ts->sysinfo_data));
+	} while (!((retval == 0) &&
+		!((ts->sysinfo_data.tts_verh == 0) &&
+		(ts->sysinfo_data.tts_verl == 0))) &&
+		(tries++ < CY_DELAY_MAX));
+
+	dev_dbg(ts->dev, "%s: check sysinfo ready tries=%d ret=%d\n",
+		__func__, tries, retval);
+
+	dev_info(ts->dev, "%s: tv=%02X%02X ai=0x%02X%02X "
+		"av=0x%02X%02X ci=0x%02X%02X%02X\n", "cyttsp",
+		ts->sysinfo_data.tts_verh, ts->sysinfo_data.tts_verl,
+		ts->sysinfo_data.app_idh, ts->sysinfo_data.app_idl,
+		ts->sysinfo_data.app_verh, ts->sysinfo_data.app_verl,
+		ts->sysinfo_data.cid[0], ts->sysinfo_data.cid[1],
+		ts->sysinfo_data.cid[2]);
+
+	return retval;
+}
+
+static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
+{
+	int retval = 0;
+
+	if (ts->platform_data->act_intrvl != CY_ACT_INTRVL_DFLT ||
+		ts->platform_data->tch_tmout != CY_TCH_TMOUT_DFLT ||
+		ts->platform_data->lp_intrvl != CY_LP_INTRVL_DFLT) {
+
+		u8 intrvl_ray[3];
+
+		intrvl_ray[0] = ts->platform_data->act_intrvl;
+		intrvl_ray[1] = ts->platform_data->tch_tmout;
+		intrvl_ray[2] = ts->platform_data->lp_intrvl;
+
+		/* set intrvl registers */
+		retval = ttsp_write_block_data(ts,
+				CY_REG_ACT_INTRVL,
+				sizeof(intrvl_ray), intrvl_ray);
+
+		msleep(CY_DELAY_DFLT);
+	}
+
+	return retval;
+}
+
+static int cyttsp_soft_reset(struct cyttsp *ts)
+{
+	int retval;
+	u8 cmd = CY_SOFT_RESET_MODE;
+
+	retval = ttsp_write_block_data(ts, CY_REG_BASE, sizeof(cmd), &cmd);
+	if (retval < 0)
+		return retval;
+
+	/* wait for interrupt to set ready completion */
+	INIT_COMPLETION(ts->bl_ready);
+
+	retval = wait_for_completion_interruptible_timeout(&ts->bl_ready,
+		msecs_to_jiffies(CY_DELAY_DFLT * CY_DELAY_MAX));
+
+	if (retval > 0)
+		retval = 0;
+
+	return retval;
+}
+
+static int cyttsp_act_dist_setup(struct cyttsp *ts)
+{
+	int retval;
+	u8 act_dist_setup;
+
+	/* Init gesture; active distance setup */
+	act_dist_setup = ts->platform_data->act_dist;
+	retval = ttsp_write_block_data(ts, CY_REG_ACT_DIST,
+		sizeof(act_dist_setup), &act_dist_setup);
+
+	return retval;
+}
+
+static int cyttsp_hndshk(struct cyttsp *ts, u8 hst_mode)
+{
+	int retval;
+	u8 cmd;
+
+	cmd = hst_mode & CY_HNDSHK_BIT ?
+		hst_mode & ~CY_HNDSHK_BIT :
+		hst_mode | CY_HNDSHK_BIT;
+
+	retval = ttsp_write_block_data(ts, CY_REG_BASE,
+		sizeof(cmd), (u8 *)&cmd);
+
+	return retval;
+}
+
+/* process current touches */
+#define CY_MAX_TCH	2
+static int cyttsp_xy_worker(struct cyttsp *ts)
+{
+	u8 num_cur_tch;
+	u16 x[CY_MAX_TCH];
+	u16 y[CY_MAX_TCH];
+	u8 z[CY_MAX_TCH];
+	bool t[CY_MAX_TCH];
+	int i;
+
+	/* Get touch data from CYTTSP device */
+	if (ttsp_read_block_data(ts,
+		CY_REG_BASE, sizeof(struct cyttsp_xydata), &ts->xy_data))
+		return 0;
+
+	/* touch extension handling */
+	if (ttsp_tch_ext(ts, &ts->xy_data))
+		return 0;
+
+	/* provide flow control handshake */
+	if (ts->platform_data->use_hndshk)
+		if (cyttsp_hndshk(ts, ts->xy_data.hst_mode))
+			return 0;
+
+	/* determine number of currently active touches */
+	num_cur_tch = GET_NUM_TOUCHES(ts->xy_data.tt_stat);
+
+	/* check for any error conditions */
+	if (ts->power_state == CY_IDLE_STATE)
+		return 0;
+	else if (GET_BOOTLOADERMODE(ts->xy_data.tt_mode)) {
+		return -1;
+	} else if (IS_LARGE_AREA(ts->xy_data.tt_stat) == 1) {
+		/* terminate all active tracks */
+		num_cur_tch = 0;
+		dev_dbg(ts->dev, "%s: Large area detected\n", __func__);
+	} else if (num_cur_tch > CY_MAX_TCH) {
+		/* terminate all active tracks */
+		num_cur_tch = 0;
+		dev_dbg(ts->dev, "%s: Num touch error detected\n", __func__);
+	} else if (IS_BAD_PKT(ts->xy_data.tt_mode)) {
+		/* terminate all active tracks */
+		num_cur_tch = 0;
+		dev_dbg(ts->dev, "%s: Invalid buffer detected\n", __func__);
+	}
+
+	/* send touches */
+	if (!num_cur_tch)
+		/* terminate previous active touch */
+		input_mt_sync(ts->input);
+	else {
+		/* get touch 1 */
+		/*
+		 * If there is only one current active touch,
+		 * it will be reported in the touch 1 regardless
+		 * if it was reported in the touch 2 previously
+		 */
+		x[0] = (ts->xy_data.tch1_xhi << 8) + ts->xy_data.tch1_xlo;
+		y[0] = (ts->xy_data.tch1_yhi << 8) + ts->xy_data.tch1_ylo;
+		z[0] = ts->xy_data.tch1_z;
+		t[0] = true;
+
+		/* get touch 2 */
+		if (num_cur_tch == CY_MAX_TCH) {
+			x[1] = (ts->xy_data.tch2_xhi << 8) +
+				ts->xy_data.tch2_xlo;
+			y[1] = (ts->xy_data.tch2_yhi << 8) +
+				ts->xy_data.tch2_ylo;
+			z[1] = ts->xy_data.tch2_z;
+			t[1] = true;
+		}
+
+		for (i = 0; i < CY_MAX_TCH; i++) {
+			if (t[i]) {
+				input_report_abs(ts->input,
+					ABS_MT_POSITION_X, x[i]);
+				input_report_abs(ts->input,
+					ABS_MT_POSITION_Y, y[i]);
+				input_report_abs(ts->input,
+					ABS_MT_TOUCH_MAJOR, z[i]);
+				input_mt_sync(ts->input);
+			}
+		}
+	}
+
+	input_sync(ts->input);
+
+	return 0;
+}
+
+static void cyttsp_pr_state(struct cyttsp *ts)
+{
+	static char *cyttsp_powerstate_string[] = {
+		"IDLE",
+		"ACTIVE",
+		"LOW_PWR",
+		"SLEEP",
+		"BOOTLOADER",
+		"INVALID"
+	};
+
+	dev_info(ts->dev, "%s: %s\n", __func__,
+		ts->power_state < CY_INVALID_STATE ?
+		cyttsp_powerstate_string[ts->power_state] :
+		"INVALID");
+}
+
+static irqreturn_t cyttsp_irq(int irq, void *handle)
+{
+	struct cyttsp *ts = handle;
+	int retval;
+
+	if (ts->power_state == CY_BL_STATE)
+		complete(&ts->bl_ready);
+	else {
+		/* process the touches */
+		retval = cyttsp_xy_worker(ts);
+
+		if (retval < 0) {
+			/*
+			 * TTSP device has reset back to bootloader mode.
+			 * Restore to operational mode.
+			 */
+			retval = cyttsp_exit_bl_mode(ts);
+			if (retval)
+				ts->power_state = CY_IDLE_STATE;
+			else
+				ts->power_state = CY_ACTIVE_STATE;
+			cyttsp_pr_state(ts);
+		}
+	}
+	return IRQ_HANDLED;
+}
+
+static int cyttsp_power_on(struct cyttsp *ts)
+{
+	int retval = 0;
+
+	if (!ts)
+		return -ENOMEM;
+
+	ts->power_state = CY_BL_STATE;
+
+	/* enable interrupts */
+	retval = request_threaded_irq(ts->irq, NULL, cyttsp_irq,
+		IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+		ts->platform_data->name, ts);
+	if (retval < 0)
+		goto bypass;
+
+	retval = cyttsp_soft_reset(ts);
+	if (retval < 0)
+		goto bypass;
+
+	retval = cyttsp_bl_app_valid(ts);
+	if (retval < 0)
+		goto bypass;
+	else if (retval > 0)
+		goto no_bl_bypass;
+
+	retval = cyttsp_exit_bl_mode(ts);
+
+	if (retval < 0)
+		goto bypass;
+
+	ts->power_state = CY_IDLE_STATE;
+
+no_bl_bypass:
+	retval = cyttsp_set_sysinfo_mode(ts);
+	if (retval < 0)
+		goto bypass;
+
+	retval = cyttsp_set_sysinfo_regs(ts);
+	if (retval < 0)
+		goto bypass;
+
+	retval = cyttsp_set_operational_mode(ts);
+	if (retval < 0)
+		goto bypass;
+
+	/* init active distance */
+	retval = cyttsp_act_dist_setup(ts);
+	if (retval < 0)
+		goto bypass;
+
+	ts->power_state = CY_ACTIVE_STATE;
+	retval = 0;
+
+bypass:
+	cyttsp_pr_state(ts);
+	return retval;
+}
+
+#ifdef CONFIG_PM
+int cyttsp_resume(void *handle)
+{
+	struct cyttsp *ts = handle;
+	int retval = 0;
+	struct cyttsp_xydata xydata;
+
+	if (ts->platform_data->use_sleep && (ts->power_state !=
+		CY_ACTIVE_STATE)) {
+		if (ts->platform_data->wakeup) {
+			retval = ts->platform_data->wakeup();
+			if (retval < 0)
+				dev_dbg(ts->dev, "%s: Error, wakeup failed!\n",
+					__func__);
+		} else {
+			dev_dbg(ts->dev, "%s: Error, wakeup not implemented "
+				"(check board file).\n", __func__);
+			retval = -ENOSYS;
+		}
+		if (!(retval < 0)) {
+			retval = ttsp_read_block_data(ts, CY_REG_BASE,
+				sizeof(xydata), &xydata);
+			if (!(retval < 0) && !GET_HSTMODE(xydata.hst_mode))
+				ts->power_state = CY_ACTIVE_STATE;
+		}
+	}
+	dev_dbg(ts->dev, "%s: Wake Up %s\n", __func__,
+		(retval < 0) ? "FAIL" : "PASS");
+	return retval;
+}
+EXPORT_SYMBOL_GPL(cyttsp_resume);
+
+int cyttsp_suspend(void *handle)
+{
+	struct cyttsp *ts = handle;
+	u8 sleep_mode = 0;
+	int retval = 0;
+
+	if (ts->platform_data->use_sleep &&
+		(ts->power_state == CY_ACTIVE_STATE)) {
+		sleep_mode = CY_DEEP_SLEEP_MODE;
+		retval = ttsp_write_block_data(ts,
+			CY_REG_BASE, sizeof(sleep_mode), &sleep_mode);
+		if (!(retval < 0))
+			ts->power_state = CY_SLEEP_STATE;
+	}
+	dev_dbg(ts->dev, "%s: Sleep Power state is %s\n", __func__,
+		(ts->power_state == CY_ACTIVE_STATE) ?
+		"ACTIVE" :
+		((ts->power_state == CY_SLEEP_STATE) ?
+		"SLEEP" : "LOW POWER"));
+	return retval;
+}
+EXPORT_SYMBOL_GPL(cyttsp_suspend);
+#endif
+
+static int cyttsp_open(struct input_dev *dev)
+{
+	struct cyttsp *ts = input_get_drvdata(dev);
+
+	return cyttsp_power_on(ts);
+}
+
+void cyttsp_core_release(void *handle)
+{
+	struct cyttsp *ts = handle;
+
+	if (ts) {
+		free_irq(ts->irq, ts);
+		input_unregister_device(ts->input);
+		if (ts->platform_data->exit)
+			ts->platform_data->exit();
+		kfree(ts);
+	}
+}
+EXPORT_SYMBOL_GPL(cyttsp_core_release);
+
+static void cyttsp_close(struct input_dev *dev)
+{
+	struct cyttsp *ts = input_get_drvdata(dev);
+
+	free_irq(ts->irq, ts);
+}
+
+void *cyttsp_core_init(struct cyttsp_bus_ops *bus_ops, struct device *dev)
+{
+	struct input_dev *input_device;
+
+	struct cyttsp *ts = kzalloc(sizeof(*ts), GFP_KERNEL);
+
+	if (!ts) {
+		pr_err("%s: Error, kzalloc\n", __func__);
+		goto error_alloc_data;
+	}
+
+	if (dev == NULL || bus_ops == NULL) {
+		kfree(ts);
+		goto error_alloc_data;
+	}
+
+	ts->dev = dev;
+	ts->platform_data = dev->platform_data;
+	ts->bus_ops = bus_ops;
+	init_completion(&ts->bl_ready);
+
+	if (ts->platform_data->init) {
+		if (ts->platform_data->init()) {
+			dev_dbg(ts->dev, "%s: Error, platform init failed!\n",
+				__func__);
+			goto error_init;
+		}
+	}
+
+	ts->irq = gpio_to_irq(ts->platform_data->irq_gpio);
+	if (ts->irq <= 0) {
+		dev_dbg(ts->dev, "%s: Error, failed to allocate irq\n",
+			__func__);
+			goto error_init;
+	}
+
+	/* Create the input device and register it. */
+	input_device = input_allocate_device();
+	if (!input_device) {
+		dev_dbg(ts->dev, "%s: Error, failed to allocate input device\n",
+			__func__);
+		goto error_input_allocate_device;
+	}
+
+	ts->input = input_device;
+	input_device->name = ts->platform_data->name;
+	snprintf(ts->phys, sizeof(ts->phys), "%s", dev_name(dev));
+	input_device->phys = ts->phys;
+	input_device->dev.parent = ts->dev;
+	ts->bus_type = bus_ops->dev->bus;
+	input_device->open = cyttsp_open;
+	input_device->close = cyttsp_close;
+	input_set_drvdata(input_device, ts);
+
+	__set_bit(EV_SYN, input_device->evbit);
+	__set_bit(EV_KEY, input_device->evbit);
+	__set_bit(EV_ABS, input_device->evbit);
+
+	input_set_abs_params(input_device, ABS_MT_POSITION_X,
+		0, ts->platform_data->maxx, 0, 0);
+	input_set_abs_params(input_device, ABS_MT_POSITION_Y,
+		0, ts->platform_data->maxy, 0, 0);
+	input_set_abs_params(input_device, ABS_MT_TOUCH_MAJOR,
+		0, CY_MAXZ, 0, 0);
+
+	if (input_register_device(input_device)) {
+		dev_dbg(ts->dev, "%s: Error, failed to register input device\n",
+			__func__);
+		goto error_input_register_device;
+	}
+
+	goto no_error;
+
+error_input_register_device:
+	input_unregister_device(input_device);
+error_input_allocate_device:
+	if (ts->platform_data->exit)
+		ts->platform_data->exit();
+error_init:
+	kfree(ts);
+error_alloc_data:
+no_error:
+	return ts;
+}
+EXPORT_SYMBOL_GPL(cyttsp_core_init);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard touchscreen driver core");
+MODULE_AUTHOR("Cypress");
+
diff --git a/drivers/input/touchscreen/cyttsp_core.h b/drivers/input/touchscreen/cyttsp_core.h
new file mode 100644
index 0000000..78001b5
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_core.h
@@ -0,0 +1,55 @@
+/*
+ * Header file for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <kev@xxxxxxxxxxx>
+ *
+ */
+
+
+#ifndef __CYTTSP_CORE_H__
+#define __CYTTSP_CORE_H__
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/input/cyttsp.h>
+
+#define CY_NUM_RETRY                4 /* max number of retries for read ops */
+
+
+struct cyttsp_bus_ops {
+	s32 (*write)(void *handle, u8 addr, u8 length, const void *values);
+	s32 (*read)(void *handle, u8 addr, u8 length, void *values);
+	s32 (*ext)(void *handle, void *values);
+	struct device *dev;
+};
+
+void *cyttsp_core_init(struct cyttsp_bus_ops *bus_ops, struct device *dev);
+
+void cyttsp_core_release(void *handle);
+#ifdef CONFIG_PM
+int cyttsp_resume(void *handle);
+int cyttsp_suspend(void *handle);
+#endif
+
+#endif /* __CYTTSP_CORE_H__ */
diff --git a/include/linux/input/cyttsp.h b/include/linux/input/cyttsp.h
new file mode 100644
index 0000000..3907bfc
--- /dev/null
+++ b/include/linux/input/cyttsp.h
@@ -0,0 +1,68 @@
+/*
+ * Header file for:
+ * Cypress TrueTouch(TM) Standard Product (TTSP) touchscreen drivers.
+ * For use with Cypress Txx3xx parts.
+ * Supported parts include:
+ * CY8CTST341
+ * CY8CTMA340
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com (kev@xxxxxxxxxxx)
+ *
+ */
+#ifndef _CYTTSP_H_
+#define _CYTTSP_H_
+
+#define CY_SPI_NAME "cyttsp-spi"
+#define CY_I2C_NAME "cyttsp-i2c"
+/* Active Power state scanning/processing refresh interval */
+#define CY_ACT_INTRVL_DFLT 0x00 /* ms */
+/* touch timeout for the Active power */
+#define CY_TCH_TMOUT_DFLT 0xFF /* ms */
+/* Low Power state scanning/processing refresh interval */
+#define CY_LP_INTRVL_DFLT 0x0A /* ms */
+/* Active distance in pixels for a gesture to be reported */
+#define CY_ACT_DIST_DFLT 0xF8 /* pixels */
+
+enum cyttsp_powerstate {
+	CY_IDLE_STATE,
+	CY_ACTIVE_STATE,
+	CY_LOW_PWR_STATE,
+	CY_SLEEP_STATE,
+	CY_BL_STATE,
+	CY_INVALID_STATE	/* always last in the list */
+};
+
+struct cyttsp_platform_data {
+	u32 maxx;
+	u32 maxy;
+	bool use_hndshk;
+	bool use_sleep;
+	u8 act_dist;	/* Active distance */
+	u8 act_intrvl;  /* Active refresh interval; ms */
+	u8 tch_tmout;   /* Active touch timeout; ms */
+	u8 lp_intrvl;   /* Low power refresh interval; ms */
+	int (*wakeup)(void);
+	int (*init)(void);
+	void (*exit)(void);
+	char *name;
+	s16 irq_gpio;
+	u8 *bl_keys;
+};
+
+#endif /* _CYTTSP_H_ */
-- 
1.7.2.1


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