Input: add touchscreen driver for MELFAS MCS-5000 controller

The MELPAS MCS-5000 is the touchscreen controller. The overview of this
controller can see at the following website:

http://www.melfas.com/product/product01.asp?k_r=eng_

This driver is tested on s3c6410 NCP board and supports only the i2c
interface.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 330 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 5a252d449e55..6dfb0a2b0a7d 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -169,6 +169,17 @@ config TOUCHSCREEN_WACOM_W8001
           To compile this driver as a module, choose M here: the
           module will be called wacom_w8001.
 
+config TOUCHSCREEN_MCS5000
+        tristate "MELFAS MCS-5000 touchscreen"
+        depends on I2C
+        help
+          Say Y here if you have the MELFAS MCS-5000 touchscreen controller
+          chip in your system.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called mcs5000_ts.
 
 config TOUCHSCREEN_MTOUCH
         tristate "MicroTouch serial touchscreens"
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 3e1c5e0b952f..a882ca16506b 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI)		+= eeti_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ELO)           += elo.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)       += fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_INEXIO)        += inexio.o
+obj-$(CONFIG_TOUCHSCREEN_MCS5000)       += mcs5000_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MIGOR)         += migor_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MTOUCH)        += mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712)         += mk712.o
diff --git a/drivers/input/touchscreen/mcs5000_ts.c b/drivers/input/touchscreen/mcs5000_ts.c
new file mode 100644
index 000000000000..4c28b89757f9
--- /dev/null
+++ b/drivers/input/touchscreen/mcs5000_ts.c
@@ -0,0 +1,318 @@
+/*
+ * mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller
+ *
+ * Copyright (C) 2009 Samsung Electronics Co.Ltd
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ *
+ * Based on wm97xx-core.c
+ *
+ *  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/i2c.h>
+#include <linux/i2c/mcs5000_ts.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+
+/* Registers */
+#define MCS5000_TS_STATUS               0x00
+#define STATUS_OFFSET                   0
+#define STATUS_NO                       (0 << STATUS_OFFSET)
+#define STATUS_INIT                     (1 << STATUS_OFFSET)
+#define STATUS_SENSING                  (2 << STATUS_OFFSET)
+#define STATUS_COORD                    (3 << STATUS_OFFSET)
+#define STATUS_GESTURE                  (4 << STATUS_OFFSET)
+#define ERROR_OFFSET                    4
+#define ERROR_NO                        (0 << ERROR_OFFSET)
+#define ERROR_POWER_ON_RESET            (1 << ERROR_OFFSET)
+#define ERROR_INT_RESET                 (2 << ERROR_OFFSET)
+#define ERROR_EXT_RESET                 (3 << ERROR_OFFSET)
+#define ERROR_INVALID_REG_ADDRESS       (8 << ERROR_OFFSET)
+#define ERROR_INVALID_REG_VALUE         (9 << ERROR_OFFSET)
+
+#define MCS5000_TS_OP_MODE              0x01
+#define RESET_OFFSET                    0
+#define RESET_NO                        (0 << RESET_OFFSET)
+#define RESET_EXT_SOFT                  (1 << RESET_OFFSET)
+#define OP_MODE_OFFSET                  1
+#define OP_MODE_SLEEP                   (0 << OP_MODE_OFFSET)
+#define OP_MODE_ACTIVE                  (1 << OP_MODE_OFFSET)
+#define GESTURE_OFFSET                  4
+#define GESTURE_DISABLE                 (0 << GESTURE_OFFSET)
+#define GESTURE_ENABLE                  (1 << GESTURE_OFFSET)
+#define PROXIMITY_OFFSET                5
+#define PROXIMITY_DISABLE               (0 << PROXIMITY_OFFSET)
+#define PROXIMITY_ENABLE                (1 << PROXIMITY_OFFSET)
+#define SCAN_MODE_OFFSET                6
+#define SCAN_MODE_INTERRUPT             (0 << SCAN_MODE_OFFSET)
+#define SCAN_MODE_POLLING               (1 << SCAN_MODE_OFFSET)
+#define REPORT_RATE_OFFSET              7
+#define REPORT_RATE_40                  (0 << REPORT_RATE_OFFSET)
+#define REPORT_RATE_80                  (1 << REPORT_RATE_OFFSET)
+
+#define MCS5000_TS_SENS_CTL             0x02
+#define MCS5000_TS_FILTER_CTL           0x03
+#define PRI_FILTER_OFFSET               0
+#define SEC_FILTER_OFFSET               4
+
+#define MCS5000_TS_X_SIZE_UPPER         0x08
+#define MCS5000_TS_X_SIZE_LOWER         0x09
+#define MCS5000_TS_Y_SIZE_UPPER         0x0A
+#define MCS5000_TS_Y_SIZE_LOWER         0x0B
+
+#define MCS5000_TS_INPUT_INFO           0x10
+#define INPUT_TYPE_OFFSET               0
+#define INPUT_TYPE_NONTOUCH             (0 << INPUT_TYPE_OFFSET)
+#define INPUT_TYPE_SINGLE               (1 << INPUT_TYPE_OFFSET)
+#define INPUT_TYPE_DUAL                 (2 << INPUT_TYPE_OFFSET)
+#define INPUT_TYPE_PALM                 (3 << INPUT_TYPE_OFFSET)
+#define INPUT_TYPE_PROXIMITY            (7 << INPUT_TYPE_OFFSET)
+#define GESTURE_CODE_OFFSET             3
+#define GESTURE_CODE_NO                 (0 << GESTURE_CODE_OFFSET)
+
+#define MCS5000_TS_X_POS_UPPER          0x11
+#define MCS5000_TS_X_POS_LOWER          0x12
+#define MCS5000_TS_Y_POS_UPPER          0x13
+#define MCS5000_TS_Y_POS_LOWER          0x14
+#define MCS5000_TS_Z_POS                0x15
+#define MCS5000_TS_WIDTH                0x16
+#define MCS5000_TS_GESTURE_VAL          0x17
+#define MCS5000_TS_MODULE_REV           0x20
+#define MCS5000_TS_FIRMWARE_VER         0x21
+
+/* Touchscreen absolute values */
+#define MCS5000_MAX_XC                  0x3ff
+#define MCS5000_MAX_YC                  0x3ff
+
+enum mcs5000_ts_read_offset {
+        READ_INPUT_INFO,
+        READ_X_POS_UPPER,
+        READ_X_POS_LOWER,
+        READ_Y_POS_UPPER,
+        READ_Y_POS_LOWER,
+        READ_BLOCK_SIZE,
+};
+
+/* Each client has this additional data */
+struct mcs5000_ts_data {
+        struct i2c_client *client;
+        struct input_dev *input_dev;
+        const struct mcs5000_ts_platform_data *platform_data;
+};
+
+static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)
+{
+        struct mcs5000_ts_data *data = dev_id;
+        struct i2c_client *client = data->client;
+        u8 buffer[READ_BLOCK_SIZE];
+        int err;
+        int x;
+        int y;
+
+        err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO,
+                        READ_BLOCK_SIZE, buffer);
+        if (err < 0) {
+                dev_err(&client->dev, "%s, err[%d]\n", __func__, err);
+                goto out;
+        }
+
+        switch (buffer[READ_INPUT_INFO]) {
+        case INPUT_TYPE_NONTOUCH:
+                input_report_key(data->input_dev, BTN_TOUCH, 0);
+                input_sync(data->input_dev);
+                break;
+
+        case INPUT_TYPE_SINGLE:
+                x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER];
+                y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER];
+
+                input_report_key(data->input_dev, BTN_TOUCH, 1);
+                input_report_abs(data->input_dev, ABS_X, x);
+                input_report_abs(data->input_dev, ABS_Y, y);
+                input_sync(data->input_dev);
+                break;
+
+        case INPUT_TYPE_DUAL:
+                /* TODO */
+                break;
+
+        case INPUT_TYPE_PALM:
+                /* TODO */
+                break;
+
+        case INPUT_TYPE_PROXIMITY:
+                /* TODO */
+                break;
+
+        default:
+                dev_err(&client->dev, "Unknown ts input type %d\n",
+                                buffer[READ_INPUT_INFO]);
+                break;
+        }
+
+ out:
+        return IRQ_HANDLED;
+}
+
+static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
+{
+        const struct mcs5000_ts_platform_data *platform_data =
+                data->platform_data;
+        struct i2c_client *client = data->client;
+
+        /* Touch reset & sleep mode */
+        i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,
+                        RESET_EXT_SOFT | OP_MODE_SLEEP);
+
+        /* Touch size */
+        i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER,
+                        platform_data->x_size >> 8);
+        i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER,
+                        platform_data->x_size & 0xff);
+        i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER,
+                        platform_data->y_size >> 8);
+        i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER,
+                        platform_data->y_size & 0xff);
+
+        /* Touch active mode & 80 report rate */
+        i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE,
+                        OP_MODE_ACTIVE | REPORT_RATE_80);
+}
+
+static int __devinit mcs5000_ts_probe(struct i2c_client *client,
+                const struct i2c_device_id *id)
+{
+        struct mcs5000_ts_data *data;
+        struct input_dev *input_dev;
+        int ret;
+
+        if (!client->dev.platform_data)
+                return -EINVAL;
+
+        data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!data || !input_dev) {
+                dev_err(&client->dev, "Failed to allocate memory\n");
+                ret = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        data->client = client;
+        data->input_dev = input_dev;
+        data->platform_data = client->dev.platform_data;
+
+        input_dev->name = "MELPAS MCS-5000 Touchscreen";
+        input_dev->id.bustype = BUS_I2C;
+        input_dev->dev.parent = &client->dev;
+
+        __set_bit(EV_ABS, input_dev->evbit);
+        __set_bit(EV_KEY, input_dev->evbit);
+        __set_bit(BTN_TOUCH, input_dev->keybit);
+        input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0);
+        input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0);
+
+        input_set_drvdata(input_dev, data);
+
+        if (data->platform_data->cfg_pin)
+                data->platform_data->cfg_pin();
+
+        ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,
+                        IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);
+
+        if (ret < 0) {
+                dev_err(&client->dev, "Failed to register interrupt\n");
+                goto err_free_mem;
+        }
+
+        ret = input_register_device(data->input_dev);
+        if (ret < 0)
+                goto err_free_irq;
+
+        mcs5000_ts_phys_init(data);
+        i2c_set_clientdata(client, data);
+
+        return 0;
+
+err_free_irq:
+        free_irq(client->irq, data);
+err_free_mem:
+        input_free_device(input_dev);
+        kfree(data);
+        return ret;
+}
+
+static int __devexit mcs5000_ts_remove(struct i2c_client *client)
+{
+        struct mcs5000_ts_data *data = i2c_get_clientdata(client);
+
+        free_irq(client->irq, data);
+        input_unregister_device(data->input_dev);
+        kfree(data);
+        i2c_set_clientdata(client, NULL);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int mcs5000_ts_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+        /* Touch sleep mode */
+        i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
+
+        return 0;
+}
+
+static int mcs5000_ts_resume(struct i2c_client *client)
+{
+        struct mcs5000_ts_data *data = i2c_get_clientdata(client);
+
+        mcs5000_ts_phys_init(data);
+
+        return 0;
+}
+#else
+#define mcs5000_ts_suspend      NULL
+#define mcs5000_ts_resume       NULL
+#endif
+
+static const struct i2c_device_id mcs5000_ts_id[] = {
+        { "mcs5000_ts", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
+
+static struct i2c_driver mcs5000_ts_driver = {
+        .probe          = mcs5000_ts_probe,
+        .remove         = __devexit_p(mcs5000_ts_remove),
+        .suspend        = mcs5000_ts_suspend,
+        .resume         = mcs5000_ts_resume,
+        .driver = {
+                .name = "mcs5000_ts",
+        },
+        .id_table       = mcs5000_ts_id,
+};
+
+static int __init mcs5000_ts_init(void)
+{
+        return i2c_add_driver(&mcs5000_ts_driver);
+}
+
+static void __exit mcs5000_ts_exit(void)
+{
+        i2c_del_driver(&mcs5000_ts_driver);
+}
+
+module_init(mcs5000_ts_init);
+module_exit(mcs5000_ts_exit);
+
+/* Module information */
+MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
+MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");
+MODULE_LICENSE("GPL");