Input: add MELFAS MIP4 Touchscreen driver

This is an input driver for MELFAS MIP4 Touchscreen devices, such as
MMS400, MMS500, MCS8000, MIT200, MIT300, MIT400, MFS10. All devices
implementing MIP4 protocol (MELFAS Interface Protocol Version 4) should
be supported by this driver.

Signed-off-by: Sangwon Jee <jeesw@melfas.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

3 files changed, 1511 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index f4e53b4a6062..309951da0970 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -491,6 +491,17 @@ config TOUCHSCREEN_MMS114
           To compile this driver as a module, choose M here: the
           module will be called mms114.
 
+config TOUCHSCREEN_MELFAS_MIP4
+        tristate "MELFAS MIP4 Touchscreen"
+        depends on I2C
+        help
+          Say Y here if you have a MELFAS MIP4 Touchscreen device.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here:
+          the module will be called melfas_mip4.
+
 config TOUCHSCREEN_MTOUCH
         tristate "MicroTouch serial touchscreens"
         select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 968ff12e3132..4b518c76e0d7 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_TOUCHSCREEN_LPC32XX)	+= lpc32xx_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MAX11801)      += max11801_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MC13783)       += mc13783_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MCS5000)       += mcs5000_ts.o
+obj-$(CONFIG_TOUCHSCREEN_MELFAS_MIP4)   += melfas_mip4.o
 obj-$(CONFIG_TOUCHSCREEN_MIGOR)         += migor_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MMS114)        += mms114.o
 obj-$(CONFIG_TOUCHSCREEN_MTOUCH)        += mtouch.o
diff --git a/drivers/input/touchscreen/melfas_mip4.c b/drivers/input/touchscreen/melfas_mip4.c
new file mode 100644
index 000000000000..b8e9ead61ee2
--- /dev/null
+++ b/drivers/input/touchscreen/melfas_mip4.c
@@ -0,0 +1,1499 @@
+/*
+ * MELFAS MIP4 Touchscreen
+ *
+ * Copyright (C) 2016 MELFAS Inc.
+ *
+ * Author : Sangwon Jee <jeesw@melfas.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.
+ *
+ * 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.
+ */
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+
+#define MIP4_DEVICE_NAME        "mip4_ts"
+
+/*****************************************************************
+ * Protocol
+ * Version : MIP 4.0 Rev 4.4
+ *****************************************************************/
+
+/* Address */
+#define MIP4_R0_BOOT                            0x00
+#define MIP4_R1_BOOT_MODE                       0x01
+#define MIP4_R1_BOOT_BUF_ADDR                   0x10
+#define MIP4_R1_BOOT_STATUS                     0x20
+#define MIP4_R1_BOOT_CMD                        0x30
+#define MIP4_R1_BOOT_TARGET_ADDR                0x40
+#define MIP4_R1_BOOT_SIZE                       0x44
+
+#define MIP4_R0_INFO                            0x01
+#define MIP4_R1_INFO_PRODUCT_NAME               0x00
+#define MIP4_R1_INFO_RESOLUTION_X               0x10
+#define MIP4_R1_INFO_RESOLUTION_Y               0x12
+#define MIP4_R1_INFO_NODE_NUM_X                 0x14
+#define MIP4_R1_INFO_NODE_NUM_Y                 0x15
+#define MIP4_R1_INFO_KEY_NUM                    0x16
+#define MIP4_R1_INFO_VERSION_BOOT               0x20
+#define MIP4_R1_INFO_VERSION_CORE               0x22
+#define MIP4_R1_INFO_VERSION_APP                0x24
+#define MIP4_R1_INFO_VERSION_PARAM              0x26
+#define MIP4_R1_INFO_SECT_BOOT_START            0x30
+#define MIP4_R1_INFO_SECT_BOOT_END              0x31
+#define MIP4_R1_INFO_SECT_CORE_START            0x32
+#define MIP4_R1_INFO_SECT_CORE_END              0x33
+#define MIP4_R1_INFO_SECT_APP_START             0x34
+#define MIP4_R1_INFO_SECT_APP_END               0x35
+#define MIP4_R1_INFO_SECT_PARAM_START           0x36
+#define MIP4_R1_INFO_SECT_PARAM_END             0x37
+#define MIP4_R1_INFO_BUILD_DATE                 0x40
+#define MIP4_R1_INFO_BUILD_TIME                 0x44
+#define MIP4_R1_INFO_CHECKSUM_PRECALC           0x48
+#define MIP4_R1_INFO_CHECKSUM_REALTIME          0x4A
+#define MIP4_R1_INFO_PROTOCOL_NAME              0x50
+#define MIP4_R1_INFO_PROTOCOL_VERSION           0x58
+#define MIP4_R1_INFO_IC_ID                      0x70
+#define MIP4_R1_INFO_IC_NAME                    0x71
+#define MIP4_R1_INFO_IC_VENDOR_ID               0x75
+#define MIP4_R1_INFO_IC_HW_CATEGORY             0x77
+#define MIP4_R1_INFO_CONTACT_THD_SCR            0x78
+#define MIP4_R1_INFO_CONTACT_THD_KEY            0x7A
+
+#define MIP4_R0_EVENT                           0x02
+#define MIP4_R1_EVENT_SUPPORTED_FUNC            0x00
+#define MIP4_R1_EVENT_FORMAT                    0x04
+#define MIP4_R1_EVENT_SIZE                      0x06
+#define MIP4_R1_EVENT_PACKET_INFO               0x10
+#define MIP4_R1_EVENT_PACKET_DATA               0x11
+
+#define MIP4_R0_CTRL                            0x06
+#define MIP4_R1_CTRL_READY_STATUS               0x00
+#define MIP4_R1_CTRL_EVENT_READY                0x01
+#define MIP4_R1_CTRL_MODE                       0x10
+#define MIP4_R1_CTRL_EVENT_TRIGGER_TYPE         0x11
+#define MIP4_R1_CTRL_RECALIBRATE                0x12
+#define MIP4_R1_CTRL_POWER_STATE                0x13
+#define MIP4_R1_CTRL_GESTURE_TYPE               0x14
+#define MIP4_R1_CTRL_DISABLE_ESD_ALERT          0x18
+#define MIP4_R1_CTRL_CHARGER_MODE               0x19
+#define MIP4_R1_CTRL_HIGH_SENS_MODE             0x1A
+#define MIP4_R1_CTRL_WINDOW_MODE                0x1B
+#define MIP4_R1_CTRL_PALM_REJECTION             0x1C
+#define MIP4_R1_CTRL_EDGE_CORRECTION            0x1D
+#define MIP4_R1_CTRL_ENTER_GLOVE_MODE           0x1E
+#define MIP4_R1_CTRL_I2C_ON_LPM                 0x1F
+#define MIP4_R1_CTRL_GESTURE_DEBUG              0x20
+#define MIP4_R1_CTRL_PALM_EVENT                 0x22
+#define MIP4_R1_CTRL_PROXIMITY_SENSING          0x23
+
+/* Value */
+#define MIP4_BOOT_MODE_BOOT                     0x01
+#define MIP4_BOOT_MODE_APP                      0x02
+
+#define MIP4_BOOT_STATUS_BUSY                   0x05
+#define MIP4_BOOT_STATUS_ERROR                  0x0E
+#define MIP4_BOOT_STATUS_DONE                   0xA0
+
+#define MIP4_BOOT_CMD_MASS_ERASE                0x15
+#define MIP4_BOOT_CMD_PROGRAM                   0x54
+#define MIP4_BOOT_CMD_ERASE                     0x8F
+#define MIP4_BOOT_CMD_WRITE                     0xA5
+#define MIP4_BOOT_CMD_READ                      0xC2
+
+#define MIP4_EVENT_INPUT_TYPE_KEY               0
+#define MIP4_EVENT_INPUT_TYPE_SCREEN            1
+#define MIP4_EVENT_INPUT_TYPE_PROXIMITY         2
+
+#define I2C_RETRY_COUNT                         3       /* 2~ */
+
+#define MIP4_BUF_SIZE                           128
+#define MIP4_MAX_FINGERS                        10
+#define MIP4_MAX_KEYS                           4
+
+#define MIP4_TOUCH_MAJOR_MIN                    0
+#define MIP4_TOUCH_MAJOR_MAX                    255
+#define MIP4_TOUCH_MINOR_MIN                    0
+#define MIP4_TOUCH_MINOR_MAX                    255
+#define MIP4_PRESSURE_MIN                       0
+#define MIP4_PRESSURE_MAX                       255
+
+#define MIP4_FW_NAME                    "melfas_mip4.fw"
+#define MIP4_FW_UPDATE_DEBUG            0       /* 0 (default) or 1 */
+
+struct mip4_fw_version {
+        u16 boot;
+        u16 core;
+        u16 app;
+        u16 param;
+};
+
+struct mip4_ts {
+        struct i2c_client *client;
+        struct input_dev *input;
+        struct gpio_desc *gpio_ce;
+
+        char phys[32];
+        char product_name[16];
+
+        unsigned int max_x;
+        unsigned int max_y;
+        u8 node_x;
+        u8 node_y;