[PATCH] input: enable touch on 88pm860x

[haojian.zhuang@marvell.com (Haojian Zhuang)]

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
---
 drivers/input/touchscreen/88pm860x-ts.c |  242 +++++++++++++++++++++++++++++++
 drivers/input/touchscreen/Kconfig       |   12 ++
 drivers/input/touchscreen/Makefile      |    1 +
 include/linux/mfd/88pm860x.h            |    1 +
 4 files changed, 256 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/touchscreen/88pm860x-ts.c

diff --git a/drivers/input/touchscreen/88pm860x-ts.c
b/drivers/input/touchscreen/88pm860x-ts.c
new file mode 100644
index 0000000..7944530
--- /dev/null
+++ b/drivers/input/touchscreen/88pm860x-ts.c
@@ -0,0 +1,242 @@
+/*
+ * Touchscreen driver for Marvell 88PM860x
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ * 	Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/mfd/88pm860x.h>
+
+#define MEAS_LEN		(8)
+#define ACCURATE_BIT		(12)
+
+/* touch register */
+#define MEAS_EN3		(0x52)
+
+#define MEAS_TSIX_1		(0x8D)
+#define MEAS_TSIX_2		(0x8E)
+#define MEAS_TSIY_1		(0x8F)
+#define MEAS_TSIY_2		(0x90)
+#define MEAS_TSIZ1_1		(0x91)
+#define MEAS_TSIZ1_2		(0x92)
+#define MEAS_TSIZ2_1		(0x93)
+#define MEAS_TSIZ2_2		(0x94)
+
+/* bit definitions of touch */
+#define MEAS_PD_EN		(1 << 3)
+#define MEAS_TSIX_EN		(1 << 4)
+#define MEAS_TSIY_EN		(1 << 5)
+#define MEAS_TSIZ1_EN		(1 << 6)
+#define MEAS_TSIZ2_EN		(1 << 7)
+
+struct pm860x_touch {
+	struct input_dev *idev;
+	struct i2c_client *i2c;
+	struct pm860x_chip *chip;
+	int irq;
+	int res_x;		/* resistor of Xplate */
+};
+
+static irqreturn_t pm860x_touch_handler(int irq, void *data)
+{
+	struct pm860x_touch *touch = data;
+	struct pm860x_chip *chip = touch->chip;
+	unsigned char buf[MEAS_LEN];
+	int x, y, pen_down;
+	int z1, z2, rt = 0;
+	int ret;
+
+	pm860x_mask_irq(chip, irq);
+	ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
+	if (ret < 0)
+		goto out;
+
+	pen_down = buf[1] & (1 << 6);
+	x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F);
+	y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F);
+	z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F);
+	z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F);
+
+	if (pen_down) {
+		if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
+			rt = z2 / z1 - 1;
+			rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
+			dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
+				z1, z2, rt);
+		}
+		input_report_abs(touch->idev, ABS_X, x);
+		input_report_abs(touch->idev, ABS_Y, y);
+		input_report_abs(touch->idev, ABS_PRESSURE, rt);
+		input_report_key(touch->idev, BTN_TOUCH, 1);
+	} else {
+		input_report_abs(touch->idev, ABS_PRESSURE, 0);
+		input_report_key(touch->idev, BTN_TOUCH, 0);
+	}
+	input_sync(touch->idev);
+	pm860x_unmask_irq(chip, irq);
+
+	if (pen_down)
+		dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
+	else
+		dev_dbg(chip->dev, "pen release\n");
+out:
+	return IRQ_HANDLED;
+}
+
+static int pm860x_touch_open(struct input_dev *dev)
+{
+	struct pm860x_touch *touch = input_get_drvdata(dev);
+	struct pm860x_chip *chip = touch->chip;
+	int data, ret;
+
+	data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
+		| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
+	ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
+	if (ret < 0)
+		goto out;
+	pm860x_unmask_irq(chip, touch->irq);
+	return 0;
+out:
+	return ret;
+}
+
+static void pm860x_touch_close(struct input_dev *dev)
+{
+	struct pm860x_touch *touch = input_get_drvdata(dev);
+	struct pm860x_chip *chip = touch->chip;
+	int data;
+
+	data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
+		| MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
+	pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
+	pm860x_mask_irq(chip, touch->irq);
+}
+
+static int __devinit pm860x_touch_probe(struct platform_device *pdev)
+{
+	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+	struct pm860x_platform_data *pm860x_pdata;
+	struct pm860x_touch_pdata *pdata;
+	struct pm860x_touch *touch;
+	int irq, ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "No IRQ resource!\n");
+		return -EINVAL;
+	}
+
+	if (pdev->dev.parent->platform_data) {
+		pm860x_pdata = pdev->dev.parent->platform_data;
+		pdata = pm860x_pdata->touch;
+	} else
+		pdata = NULL;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "platform data isn't assigned to "
+			"touch\n");
+		return -EINVAL;
+	}
+
+	touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
+	if (touch == NULL)
+		return -ENOMEM;
+	dev_set_drvdata(&pdev->dev, touch);
+
+	touch->idev = input_allocate_device();
+	if (touch->idev == NULL) {
+		dev_err(&pdev->dev, "Failed to allocate input device!\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	touch->idev->name = "88pm860x-touch";
+	touch->idev->phys = "88pm860x/input0";
+	touch->idev->id.bustype = BUS_I2C;
+	touch->idev->dev.parent = &pdev->dev;
+	touch->idev->open = pm860x_touch_open;
+	touch->idev->close = pm860x_touch_close;
+	touch->chip = chip;
+	touch->i2c = (chip->id == CHIP_PM8607) ? chip->client	\
+			: chip->companion;
+	touch->irq = irq;
+	touch->res_x = pdata->res_x;
+	input_set_drvdata(touch->idev, touch);
+
+	ret = pm860x_request_irq(chip, irq, pm860x_touch_handler, touch);
+	if (ret < 0)
+		goto out_irq;
+
+	__set_bit(EV_ABS, touch->idev->evbit);
+	__set_bit(ABS_X, touch->idev->absbit);
+	__set_bit(ABS_Y, touch->idev->absbit);
+	__set_bit(ABS_PRESSURE, touch->idev->absbit);
+	__set_bit(EV_SYN, touch->idev->evbit);
+	__set_bit(EV_KEY, touch->idev->evbit);
+	__set_bit(BTN_TOUCH, touch->idev->keybit);
+
+	input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
+	input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
+	input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
+				0, 0);
+
+	ret = input_register_device(touch->idev);
+	if (ret < 0) {
+		dev_err(chip->dev, "Failed to register touch!\n");
+		goto out_rg;
+	}
+
+	platform_set_drvdata(pdev, touch);
+	return 0;
+out_rg:
+	pm860x_free_irq(chip, irq);
+out_irq:
+	input_free_device(touch->idev);
+out:
+	kfree(touch);
+	return ret;
+}
+
+static int __devexit pm860x_touch_remove(struct platform_device *pdev)
+{
+	struct pm860x_touch *touch = platform_get_drvdata(pdev);
+
+	input_unregister_device(touch->idev);
+	pm860x_free_irq(touch->chip, touch->irq);
+	return 0;
+}
+
+static struct platform_driver pm860x_touch_driver = {
+	.driver	= {
+		.name	= "88pm860x-touch",
+		.owner	= THIS_MODULE,
+	},
+	.probe	= pm860x_touch_probe,
+	.remove	= __devexit_p(pm860x_touch_remove),
+};
+
+static int __init pm860x_touch_init(void)
+{
+	return platform_driver_register(&pm860x_touch_driver);
+}
+module_init(pm860x_touch_init);
+
+static void __exit pm860x_touch_exit(void)
+{
+	platform_driver_unregister(&pm860x_touch_driver);
+}
+module_exit(pm860x_touch_exit);
+
+MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:88pm860x-touch");
+
diff --git a/drivers/input/touchscreen/Kconfig
b/drivers/input/touchscreen/Kconfig
index 8cc453c..f4e6fd2 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -530,4 +530,16 @@ config TOUCHSCREEN_PCAP

 	  To compile this driver as a module, choose M here: the
 	  module will be called pcap_ts.
+
+config TOUCHSCREEN_88PM860X
+	tristate "Marvell 88PM860x touchscreen"
+	depends on MFD_88PM860X
+	help
+	  Say Y here if you have a 88PM860x PMIC and want to enable
+	  support for the built-in touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called 88pm860x-ts.
 endif
diff --git a/drivers/input/touchscreen/Makefile
b/drivers/input/touchscreen/Makefile
index 15fa62c..b278a1f 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -6,6 +6,7 @@

 wm97xx-ts-y := wm97xx-core.o

+obj-$(CONFIG_TOUCHSCREEN_88PM860X)	+= 88pm860x-ts.o
 obj-$(CONFIG_TOUCHSCREEN_AD7877)	+= ad7877.o
 obj-$(CONFIG_TOUCHSCREEN_AD7879)	+= ad7879.o
 obj-$(CONFIG_TOUCHSCREEN_ADS7846)	+= ads7846.o
diff --git a/include/linux/mfd/88pm860x.h b/include/linux/mfd/88pm860x.h
index 9bb8a10..1ecf7d3 100644
--- a/include/linux/mfd/88pm860x.h
+++ b/include/linux/mfd/88pm860x.h
@@ -341,6 +341,7 @@ struct pm860x_touch_pdata {
 	int		tsi_prebias;	/* time, slot */
 	int		pen_prebias;	/* time, slot */
 	int		pen_prechg;	/* time, slot */
+	int		res_x;		/* resistor of Xplate */
 	unsigned long	flags;
 };

-- 
1.5.6.5