3 files changed, 285 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 112ec55f2939..6b2d441a7dde 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -248,6 +248,18 @@ config TOUCHSCREEN_LPC32XX
           To compile this driver as a module, choose M here: the
           module will be called lpc32xx_ts.
 
+config TOUCHSCREEN_MAX11801
+        tristate "MAX11801 based touchscreens"
+        depends on I2C
+        help
+          Say Y here if you have a MAX11801 based touchscreen
+          controller.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called max11801_ts.
+
 config TOUCHSCREEN_MCS5000
         tristate "MELFAS MCS-5000 touchscreen"
         depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index ca94098d4c92..282d6f76ae26 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_INEXIO)        += inexio.o
 obj-$(CONFIG_TOUCHSCREEN_INTEL_MID)     += intel-mid-touch.o
 obj-$(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_MIGOR)         += migor_ts.o
diff --git a/drivers/input/touchscreen/max11801_ts.c b/drivers/input/touchscreen/max11801_ts.c
new file mode 100644
index 000000000000..4f2713d92791
--- /dev/null
+++ b/drivers/input/touchscreen/max11801_ts.c
@@ -0,0 +1,272 @@
+/*
+ * Driver for MAXI MAX11801 - A Resistive touch screen controller with
+ * i2c interface
+ *
+ * Copyright (C) 2011 Freescale Semiconductor, Inc.
+ * Author: Zhang Jiejing <jiejing.zhang@freescale.com>
+ *
+ * Based on mcs5000_ts.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.
+ */
+
+/*
+ * This driver aims to support the series of MAXI touch chips max11801
+ * through max11803. The main difference between these 4 chips can be
+ * found in the table below:
+ * -----------------------------------------------------
+ * | CHIP     |  AUTO MODE SUPPORT(FIFO) | INTERFACE    |
+ * |----------------------------------------------------|
+ * | max11800 |  YES                     |   SPI        |
+ * | max11801 |  YES                     |   I2C        |
+ * | max11802 |  NO                      |   SPI        |
+ * | max11803 |  NO                      |   I2C        |
+ * ------------------------------------------------------
+ *
+ * Currently, this driver only supports max11801.
+ *
+ * Data Sheet:
+ * http://www.maxim-ic.com/datasheet/index.mvp/id/5943
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+
+/* Register Address define */
+#define GENERNAL_STATUS_REG             0x00
+#define GENERNAL_CONF_REG               0x01
+#define MESURE_RES_CONF_REG             0x02
+#define MESURE_AVER_CONF_REG            0x03
+#define ADC_SAMPLE_TIME_CONF_REG        0x04
+#define PANEL_SETUPTIME_CONF_REG        0x05
+#define DELAY_CONVERSION_CONF_REG       0x06
+#define TOUCH_DETECT_PULLUP_CONF_REG    0x07
+#define AUTO_MODE_TIME_CONF_REG         0x08 /* only for max11800/max11801 */
+#define APERTURE_CONF_REG               0x09 /* only for max11800/max11801 */
+#define AUX_MESURE_CONF_REG             0x0a
+#define OP_MODE_CONF_REG                0x0b
+
+/* FIFO is found only in max11800 and max11801 */
+#define FIFO_RD_CMD                     (0x50 << 1)
+#define MAX11801_FIFO_INT               (1 << 2)
+#define MAX11801_FIFO_OVERFLOW          (1 << 3)
+
+#define XY_BUFSIZE                      4
+#define XY_BUF_OFFSET                   4
+
+#define MAX11801_MAX_X                  0xfff
+#define MAX11801_MAX_Y                  0xfff
+
+#define MEASURE_TAG_OFFSET              2
+#define MEASURE_TAG_MASK                (3 << MEASURE_TAG_OFFSET)
+#define EVENT_TAG_OFFSET                0
+#define EVENT_TAG_MASK                  (3 << EVENT_TAG_OFFSET)
+#define MEASURE_X_TAG                   (0 << MEASURE_TAG_OFFSET)
+#define MEASURE_Y_TAG                   (1 << MEASURE_TAG_OFFSET)
+
+/* These are the state of touch event state machine */
+enum {
+        EVENT_INIT,
+        EVENT_MIDDLE,
+        EVENT_RELEASE,
+        EVENT_FIFO_END
+};
+
+struct max11801_data {
+        struct i2c_client               *client;
+        struct input_dev                *input_dev;
+};
+
+static u8 read_register(struct i2c_client *client, int addr)
+{
+        /* XXX: The chip ignores LSB of register address */
+        return i2c_smbus_read_byte_data(client, addr << 1);
+}
+
+static int max11801_write_reg(struct i2c_client *client, int addr, int data)
+{
+        /* XXX: The chip ignores LSB of register address */
+        return i2c_smbus_write_byte_data(client, addr << 1, data);
+}
+
+static irqreturn_t max11801_ts_interrupt(int irq, void *dev_id)
+{
+        struct max11801_data *data = dev_id;
+        struct i2c_client *client = data->client;
+        int status, i, ret;
+        u8 buf[XY_BUFSIZE];
+        int x = -1;
+        int y = -1;
+
+        status = read_register(data->client, GENERNAL_STATUS_REG);
+
+        if (status & (MAX11801_FIFO_INT | MAX11801_FIFO_OVERFLOW)) {
+                status = read_register(data->client, GENERNAL_STATUS_REG);
+
+                ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_CMD,
+                                                    XY_BUFSIZE, buf);
+
+                /*
+                 * We should get 4 bytes buffer that contains X,Y
+                 * and event tag
+                 */
+                if (ret < XY_BUFSIZE)
+                        goto out;
+
+                for (i = 0; i < XY_BUFSIZE; i += XY_BUFSIZE / 2) {
+                        if ((buf[i + 1] & MEASURE_TAG_MASK) == MEASURE_X_TAG)
+                                x = (buf[i] << XY_BUF_OFFSET) +
+                                    (buf[i + 1] >> XY_BUF_OFFSET);
+                        else if ((buf[i + 1] & MEASURE_TAG_MASK) == MEASURE_Y_TAG)
+                                y = (buf[i] << XY_BUF_OFFSET) +
+                                    (buf[i + 1] >> XY_BUF_OFFSET);
+                }
+
+                if ((buf[1] & EVENT_TAG_MASK) != (buf[3] & EVENT_TAG_MASK))
+                        goto out;
+
+                switch (buf[1] & EVENT_TAG_MASK) {
+                case EVENT_INIT:
+                        /* fall through */
+                case EVENT_MIDDLE:
+                        input_report_abs(data->input_dev, ABS_X, x);
+                        input_report_abs(data->input_dev, ABS_Y, y);
+                        input_event(data->input_dev, EV_KEY, BTN_TOUCH, 1);
+                        input_sync(data->input_dev);
+                        break;
+
+                case EVENT_RELEASE:
+                        input_event(data->input_dev, EV_KEY, BTN_TOUCH, 0);
+                        input_sync(data->input_dev);
+                        break;
+
+                case EVENT_FIFO_END:
+                        break;
+                }
+        }
+out:
+        return IRQ_HANDLED;
+}
+
+static void __devinit max11801_ts_phy_init(struct max11801_data *data)
+{
+        struct i2c_client *client = data->client;
+
+        /* Average X,Y, take 16 samples, average eight media sample */
+        max11801_write_reg(client, MESURE_AVER_CONF_REG, 0xff);
+        /* X,Y panel setup time set to 20us */
+        max11801_write_reg(client, PANEL_SETUPTIME_CONF_REG, 0x11);
+        /* Rough pullup time (2uS), Fine pullup time (10us)  */
+        max11801_write_reg(client, TOUCH_DETECT_PULLUP_CONF_REG, 0x10);
+        /* Auto mode init period = 5ms , scan period = 5ms*/
+        max11801_write_reg(client, AUTO_MODE_TIME_CONF_REG, 0xaa);
+        /* Aperture X,Y set to +- 4LSB */
+        max11801_write_reg(client, APERTURE_CONF_REG, 0x33);
+        /* Enable Power, enable Automode, enable Aperture, enable Average X,Y */
+        max11801_write_reg(client, OP_MODE_CONF_REG, 0x36);
+}
+
+static int __devinit max11801_ts_probe(struct i2c_client *client,
+                                       const struct i2c_device_id *id)
+{
+        struct max11801_data *data;
+        struct input_dev *input_dev;
+        int error;
+
+        data = kzalloc(sizeof(struct max11801_data), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!data || !input_dev) {
+                dev_err(&client->dev, "Failed to allocate memory\n");
+                error = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        data->client = client;
+        data->input_dev = input_dev;
+
+        input_dev->name = "max11801_ts";
+        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, MAX11801_MAX_X, 0, 0);
+        input_set_abs_params(input_dev, ABS_Y, 0, MAX11801_MAX_Y, 0, 0);
+        input_set_drvdata(input_dev, data);
+
+        max11801_ts_phy_init(data);
+
+        error = request_threaded_irq(client->irq, NULL, max11801_ts_interrupt,
+                                     IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+                                     "max11801_ts", data);
+        if (error) {
+                dev_err(&client->dev, "Failed to register interrupt\n");
+                goto err_free_mem;
+        }
+
+        error = input_register_device(data->input_dev);
+        if (error)
+                goto err_free_irq;
+
+        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 error;
+}
+
+static __devexit int max11801_ts_remove(struct i2c_client *client)
+{
+        struct max11801_data *data = i2c_get_clientdata(client);
+
+        free_irq(client->irq, data);
+        input_unregister_device(data->input_dev);
+        kfree(data);
+
+        return 0;
+}
+
+static const struct i2c_device_id max11801_ts_id[] = {
+        {"max11801", 0},
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, max11801_ts_id);
+
+static struct i2c_driver max11801_ts_driver = {
+        .driver = {
+                .name   = "max11801_ts",
+                .owner  = THIS_MODULE,
+        },
+        .id_table       = max11801_ts_id,
+        .probe          = max11801_ts_probe,
+        .remove         = __devexit_p(max11801_ts_remove),
+};
+
+static int __init max11801_ts_init(void)
+{
+        return i2c_add_driver(&max11801_ts_driver);
+}
+
+static void __exit max11801_ts_exit(void)
+{
+        i2c_del_driver(&max11801_ts_driver);
+}
+
+module_init(max11801_ts_init);
+module_exit(max11801_ts_exit);
+
+MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>");
+MODULE_DESCRIPTION("Touchscreen driver for MAXI MAX11801 controller");
+MODULE_LICENSE("GPL");