ENGR00138130-1 input: Maxi max11801 resistance touchscreen controller

Add MAXI max11801 resistance touch screen controller driver,
add a compile config of ts_lib calibration in driver, it is default disable.

This driver use Auto Mode and Aperture Mode.

Other max1180x driver could support in this driver further.

Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>

3 files changed, 364 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 7537ffd2616..2f43f6fb236 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -650,4 +650,16 @@ config TOUCHSCREEN_DA9052
           Say y here to support the touchscreen found on
           Dialog Semiconductor DA9052 PMIC
 
+config TOUCHSCREEN_MAX11801
+       tristate "MAXIM MAX11801 touchscreen"
+       depends on I2C
+       help
+        Say Y here if you have a MAX11801 touchscreen
+        controller
+
+        If unsure, say N.
+
+        To compile this driver as a module, choose M here: the
+	  module will be called max11801_ts
+
 endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 154dbcb7220..5a46b99a690 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -52,3 +52,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE)	+= zylonite-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_W90X900)	+= w90p910_ts.o
 obj-$(CONFIG_TOUCHSCREEN_TPS6507X)	+= tps6507x-ts.o
 obj-$(CONFIG_TOUCHSCREEN_DA9052)        += da9052_tsi.o da9052_tsi_filter.o da9052_tsi_calibrate.o
+obj-$(CONFIG_TOUCHSCREEN_MAX11801)	+= max11801_ts.o
diff --git a/drivers/input/touchscreen/max11801_ts.c b/drivers/input/touchscreen/max11801_ts.c
new file mode 100644
index 00000000000..7e3dc09ca73
--- /dev/null
+++ b/drivers/input/touchscreen/max11801_ts.c
@@ -0,0 +1,351 @@
+/*
+ * max11801_ts.c - Driver for MAXI MAX11801 - A Resistive touch screen
+ * controller with i2c interface
+ *
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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 is aim for support the serial of MAXI touch chips
+ * max11801-max11803, the main different of this 4 chips can get from
+ * this table
+ * ----------------------------------------------
+ * | CHIP     |	 AUTO MODE SUPPORT | INTERFACE	|
+ * |--------------------------------------------|
+ * | max11800 |	 YES		   |   SPI	|
+ * | max11801 |	 YES		   |   I2C	|
+ * | max11802 |	 NO		   |   SPI	|
+ * | max11803 |	 NO		   |   I2C	|
+ * ----------------------------------------------
+ *
+ * Currently, this driver only support max11801.
+ * */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/delay.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
+
+#define FIFO_RD_CMD			(0x50 << 1)
+#define MAX11801_FIFO_INT		(1 << 2)
+#define MAX11801_FIFO_OVERFLOW		(1 << 3)
+
+#define READ_BUFFER_XYZ1Z2_SIZE		16
+#define XY_BUFSIZE			4
+
+#define MAX11801_MAX_XC			0xfff
+#define MAX11801_MAX_YC			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 EVENT_X_TAG			(0 << MEASURE_TAG_OFFSET)
+#define EVENT_Y_TAG			(1 << MEASURE_TAG_OFFSET)
+
+enum {
+	EVENT_INIT,
+	EVENT_MIDDLE,
+	EVENT_RELEASE,
+	EVENT_FIFO_END
+};
+
+#ifdef CALIBRATION
+/**
+ * calibration array refers to
+ * (delta_x[0], delta_x[1], delta_x[2], delta_y[0], delta_y[1],
+ * delta_y[2], delta).
+ * Which generated by calibration service.
+ * In this driver when we got touch pointer (x', y') from PMIC ADC,
+ * we calculate the display pointer (x,y) by:
+ * x = (delta_x[0] * x' + delta_x[1] * y' + delta_x[2]) / delta;
+ * y = (delta_y[0] * x' + delta_y[1] * y' + delta_y[2]) / delta;
+ */
+static int calibration[7];
+module_param_array(calibration, int, NULL, S_IRUGO | S_IWUSR);
+#endif
+
+struct max11801_data {
+	struct i2c_client		*client;
+	struct input_dev		*input_dev;
+	struct delayed_work		work;
+	struct workqueue_struct		*workq;
+};
+
+static u8 read_register(struct i2c_client *client, int addr)
+{
+	/* This chip ignore 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)
+{
+	/* This chip ignore LSB of register address */
+	return i2c_smbus_write_byte_data(client, addr << 1, data);
+}
+
+#ifdef CALIBRATION
+static void calibration_pointer(int *x_orig, int *y_orig)
+{
+	int x, y;
+	if (calibration[6] == 0)
+		return;
+	x = calibration[0] * (*x_orig) +
+		calibration[1] * (*y_orig) +
+		calibration[2];
+	x /= calibration[6];
+	if (x < 0)
+		x = 0;
+	y = calibration[3] * (*x_orig) +
+		calibration[4] * (*y_orig) +
+		calibration[5];
+	y /= calibration[6];
+	if (y < 0)
+		y = 0;
+
+	*x_orig = x;
+	*y_orig = y;
+}
+#else
+static void calibration_pointer(int *x_orig, int *y_orig)
+{
+	/* Currently, calibration algorithm will be overflow in XGA
+	 * resolution. */
+	/* Here work around for android touch screen and LCD 's rotation */
+	/* Will remove after calibration algorithm ok. */
+	int x, y;
+	/* Swap x, y */
+	x = *y_orig;
+	y = *x_orig;
+	/* Swap X  */
+	x = MAX11801_MAX_XC - x;
+	*x_orig = x;
+	*y_orig = y;
+}
+#endif
+
+static void maxi_ts_work(struct work_struct *work)
+{
+	struct max11801_data *data = container_of(to_delayed_work(work),
+						  struct max11801_data, work);
+	struct i2c_client *client = data->client;
+	unsigned int x, y;
+	int status, i, ret;
+	u8 buf[XY_BUFSIZE];
+
+	status = read_register(data->client, GENERNAL_STATUS_REG);
+	while (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);
+		if (ret < 4) {
+			dev_err(&client->dev, "event not enough\n");
+			continue;
+		}
+
+		for (i = 0; i < XY_BUFSIZE; i += 2) {
+			if ((buf[i+1] & MEASURE_TAG_MASK) == EVENT_X_TAG)
+				x = (buf[i] << 4) + (buf[i+1] >> 4);
+			else if ((buf[i+1] & MEASURE_TAG_MASK) == EVENT_Y_TAG)
+				y = (buf[i] << 4) + (buf[i+1] >> 4);
+		}
+
+		if ((buf[1] & EVENT_TAG_MASK) != (buf[3] & EVENT_TAG_MASK))
+			continue;
+
+		switch (buf[1] & EVENT_TAG_MASK) {
+		case EVENT_INIT:
+		case EVENT_MIDDLE:
+			dev_dbg(&client->dev, "before cali: x :%d y: %d\n",
+				x, y);
+			calibration_pointer(&x, &y);
+			dev_dbg(&client->dev, "after cali: x :%d y: %d\n",
+				x, y);
+			input_report_abs(data->input_dev, ABS_X, x);
+			input_report_abs(data->input_dev, ABS_Y, y);
+			input_report_abs(data->input_dev, ABS_PRESSURE, 1);
+			input_event(data->input_dev, EV_KEY, BTN_TOUCH, 1);
+			input_sync(data->input_dev);
+			break;
+		case EVENT_RELEASE:
+			input_report_abs(data->input_dev, ABS_PRESSURE, 0);
+			input_event(data->input_dev, EV_KEY, BTN_TOUCH, 0);
+			input_sync(data->input_dev);
+			break;
+		case EVENT_FIFO_END:
+			break;
+		}
+	}
+	enable_irq(client->irq);
+}
+
+static void 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 irqreturn_t max11801_irq(int irq, void *dev)
+{
+	struct max11801_data *data = dev;
+	disable_irq_nosync(irq);
+	queue_delayed_work(data->workq, &data->work, 0);
+	return IRQ_HANDLED;
+}
+
+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 ret;
+
+	data = kzalloc(sizeof(struct max11801_data), GFP_KERNEL);
+	if (!data) {
+		dev_err(&client->dev, "Failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+#ifdef CALIBRATION
+	memset(calibration, 0, sizeof(calibration));
+#endif
+
+	input_dev = input_allocate_device();
+	if (!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;
+	max11801_ts_phy_init(data);
+	INIT_DELAYED_WORK(&data->work, maxi_ts_work);
+	data->workq = create_singlethread_workqueue("max11801_ts");
+	if (!data->workq) {
+		dev_err(&client->dev, "Failed to create workqueue\n");
+		ret = -ENOMEM;
+		goto err_free_wq;
+	}
+
+	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);
+	__set_bit(ABS_X, input_dev->absbit);
+	__set_bit(ABS_Y, input_dev->absbit);
+	__set_bit(ABS_PRESSURE, input_dev->absbit);
+#ifndef CALIBRATION
+	input_set_abs_params(input_dev, ABS_X, 0, MAX11801_MAX_XC, 0, 0);
+	input_set_abs_params(input_dev, ABS_Y, 0, MAX11801_MAX_YC, 0, 0);
+#endif
+	input_set_drvdata(input_dev, data);
+
+	ret = request_irq(client->irq, max11801_irq,
+				   IRQF_TRIGGER_LOW, "max11801_ts", data);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to register interrupt\n");
+		goto err_free_dev;
+	}
+
+	ret = input_register_device(data->input_dev);
+	if (ret < 0)
+		goto err_free_irq;
+	i2c_set_clientdata(client, data);
+	return 0;
+
+err_free_irq:
+	free_irq(client->irq, data);
+err_free_wq:
+	destroy_workqueue(data->workq);
+err_free_dev:
+	input_free_device(input_dev);
+err_free_mem:
+	kfree(data);
+	return ret;
+}
+
+static __devexit int max11801_ts_remove(struct i2c_client *client)
+{
+	struct max11801_data *data = i2c_get_clientdata(client);
+
+	free_irq(client->irq, data);
+	cancel_delayed_work_sync(&data->work);
+	destroy_workqueue(data->workq);
+	input_unregister_device(data->input_dev);
+	input_free_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 = {
+	.probe		= max11801_ts_probe,
+	.remove		= __devexit_p(max11801_ts_remove),
+	.driver = {
+		.name = "max11801_ts",
+	},
+	.id_table	= max11801_ts_id,
+};
+
+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("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Touchscreen driver for MAXI MAX11801 controller");
+MODULE_LICENSE("GPL");