input: Enable touch on 88pm860x

Enable touchscreen driver for the 88pm860x multi function core.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

4 files changed, 255 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/88pm860x-ts.c b/drivers/input/touchscreen/88pm860x-ts.c
new file mode 100644
index 000000000000..56254d2a1f6e
--- /dev/null
+++ b/drivers/input/touchscreen/88pm860x-ts.c
@@ -0,0 +1,241 @@
+/*
+ * 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);
+                dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
+        } else {
+                input_report_abs(touch->idev, ABS_PRESSURE, 0);
+                input_report_key(touch->idev, BTN_TOUCH, 0);
+                dev_dbg(chip->dev, "pen release\n");
+        }
+        input_sync(touch->idev);
+        pm860x_unmask_irq(chip, irq);
+
+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 =             \
+                                pdev->dev.parent->platform_data;
+        struct pm860x_touch_pdata *pdata = NULL;
+        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 (!pm860x_pdata) {
+                dev_err(&pdev->dev, "platform data is missing\n");
+                return -EINVAL;
+        }
+
+        pdata = pm860x_pdata->touch;
+        if (!pdata) {
+                dev_err(&pdev->dev, "touchscreen data is missing\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);
+        platform_set_drvdata(pdev, NULL);
+        kfree(touch);
+        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 6457e060ae49..7208654a94ae 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -11,6 +11,18 @@ menuconfig INPUT_TOUCHSCREEN
 
 if INPUT_TOUCHSCREEN
 
+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.
+
 config TOUCHSCREEN_ADS7846
         tristate "ADS7846/TSC2046 and ADS7843 based touchscreens"
         depends on SPI_MASTER
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index d61a3b4def9a..7fef7d5cca23 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 d7edf11784f5..80bc82a7ac96 100644
--- a/include/linux/mfd/88pm860x.h
+++ b/include/linux/mfd/88pm860x.h
@@ -343,6 +343,7 @@ 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;
 };