Input: add Cypress TTSP capacitive multi-touch screen support

Cypress TrueTouch(tm) Standard Product controllers are found in
a wide range of embedded devices. This driver add support for a
variety of TTSP controllers.

Since the hardware is capable of tracking identifiable contacts, multi-touch
protocol type B (stateful) is used to report contact information.

The driver is composed of a core driver that process the data sent by
the contacts and a set of bus specific interface modules. This patch
adds the base core TTSP driver.

Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

6 files changed, 1165 insertions, 2 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 4af2a18eb3ba..2b21a7066d36 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -139,7 +139,6 @@ config TOUCHSCREEN_CY8CTMG110
         tristate "cy8ctmg110 touchscreen"
         depends on I2C
         depends on GPIOLIB
-
         help
           Say Y here if you have a cy8ctmg110 capacitive touchscreen on
           an AAVA device.
@@ -149,6 +148,37 @@ 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"
+        help
+          Say Y here if you have a touchscreen using controller from
+          the Cypress TrueTouch(tm) Standard Product family connected
+          to your system. You will also need to select appropriate
+          bus connection below.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cyttsp_core.
+
+config TOUCHSCREEN_CYTTSP_I2C
+        tristate "support I2C bus connection"
+        depends on TOUCHSCREEN_CYTTSP_CORE && I2C
+        help
+          Say Y here if the touchscreen is connected via I2C bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cyttsp_i2c.
+
+config TOUCHSCREEN_CYTTSP_SPI
+        tristate "support SPI bus connection"
+        depends on TOUCHSCREEN_CYTTSP_CORE && SPI_MASTER
+        help
+          Say Y here if the touchscreen is connected via SPI bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cyttsp_spi.
+
 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 496091e88460..d9acbdcda3d9 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -16,8 +16,11 @@ obj-$(CONFIG_TOUCHSCREEN_ATMEL_MXT)	+= atmel_mxt_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC)  += atmel_tsadcc.o
 obj-$(CONFIG_TOUCHSCREEN_AUO_PIXCIR)    += auo-pixcir-ts.o
 obj-$(CONFIG_TOUCHSCREEN_BITSY)         += h3600_ts_input.o
-obj-$(CONFIG_TOUCHSCREEN_BU21013)       += bu21013_ts.o
+obj-$(CONFIG_TOUCHSCREEN_BU21013)       += bu21013_ts.o
 obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110)    += cy8ctmg110_ts.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE)   += cyttsp_core.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C)    += cyttsp_i2c.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI)    += cyttsp_spi.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 000000000000..8be22479b41c
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -0,0 +1,625 @@
+/*
+ * 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.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
+ *
+ * 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@cypress.com>
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+#include "cyttsp_core.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
+#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
+
+/* Slots management */
+#define CY_MAX_FINGER                   4
+#define CY_MAX_ID                       16
+
+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 error;
+        int tries;
+
+        for (tries = 0; tries < CY_NUM_RETRY; tries++) {
+                error = ts->bus_ops->read(ts, command, length, buf);
+                if (!error)
+                        return 0;
+
+                msleep(CY_DELAY_DFLT);
+        }
+
+        return -EIO;
+}
+
+static int ttsp_write_block_data(struct cyttsp *ts, u8 command,
+                                 u8 length, void *buf)
+{
+        int error;
+        int tries;
+