Input: add da9034 touchscreen support

Add support for the built-in touchscreen controller in DA9034
(aka Micco), usually found on platforms with xscale processors.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 398 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 83747dc9ba05..bb6486a8c070 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -58,6 +58,14 @@ config TOUCHSCREEN_CORGI
           NOTE: this driver is deprecated, try enable SPI and generic
           ADS7846-based touchscreen driver.
 
+config TOUCHSCREEN_DA9034
+        tristate "Touchscreen support for Dialog Semiconductor DA9034"
+        depends on PMIC_DA903X
+        default y
+        help
+          Say Y here to enable the support for the touchscreen found
+          on Dialog Semiconductor DA9034 PMIC.
+
 config TOUCHSCREEN_FUJITSU
         tristate "Fujitsu serial touchscreen"
         select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 127f87cc2e2e..d3375aff46fe 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_TSC2007)	+= tsc2007.o
 obj-$(CONFIG_TOUCHSCREEN_UCB1400)       += ucb1400_ts.o
 obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001)   += wacom_w8001.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX)        += wm97xx-ts.o
+obj-$(CONFIG_TOUCHSCREEN_DA9034)        += da9034-ts.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705)  += wm9705.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712)  += wm9712.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713)  += wm9713.o
diff --git a/drivers/input/touchscreen/da9034-ts.c b/drivers/input/touchscreen/da9034-ts.c
new file mode 100644
index 000000000000..4342e77814b5
--- /dev/null
+++ b/drivers/input/touchscreen/da9034-ts.c
@@ -0,0 +1,389 @@
+/*
+ * Touchscreen driver for Dialog Semiconductor DA9034
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ *      Fengwei Yin <fengwei.yin@marvell.com>
+ *      Eric Miao <eric.miao@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/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/mfd/da903x.h>
+
+#define DA9034_MANUAL_CTRL      0x50
+#define DA9034_LDO_ADC_EN       (1 << 4)
+
+#define DA9034_AUTO_CTRL1       0x51
+
+#define DA9034_AUTO_CTRL2       0x52
+#define DA9034_AUTO_TSI_EN      (1 << 3)
+#define DA9034_PEN_DETECT       (1 << 4)
+
+#define DA9034_TSI_CTRL1        0x53
+#define DA9034_TSI_CTRL2        0x54
+#define DA9034_TSI_X_MSB        0x6c
+#define DA9034_TSI_Y_MSB        0x6d
+#define DA9034_TSI_XY_LSB       0x6e
+
+enum {
+        STATE_IDLE,     /* wait for pendown */
+        STATE_BUSY,     /* TSI busy sampling */
+        STATE_STOP,     /* sample available */
+        STATE_WAIT,     /* Wait to start next sample */
+};
+
+enum {
+        EVENT_PEN_DOWN,
+        EVENT_PEN_UP,
+        EVENT_TSI_READY,
+        EVENT_TIMEDOUT,
+};
+
+struct da9034_touch {
+        struct device           *da9034_dev;
+        struct input_dev        *input_dev;
+
+        struct delayed_work     tsi_work;
+        struct notifier_block   notifier;
+
+        int     state;
+
+        int     interval_ms;
+        int     x_inverted;
+        int     y_inverted;
+
+        int     last_x;
+        int     last_y;
+};
+
+static inline int is_pen_down(struct da9034_touch *touch)
+{
+        return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN);
+}
+
+static inline int detect_pen_down(struct da9034_touch *touch, int on)
+{
+        if (on)
+                return da903x_set_bits(touch->da9034_dev,
+                                DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
+        else
+                return da903x_clr_bits(touch->da9034_dev,
+                                DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
+}
+
+static int read_tsi(struct da9034_touch *touch)
+{
+        uint8_t _x, _y, _v;
+        int ret;
+
+        ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x);
+        if (ret)
+                return ret;
+
+        ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y);
+        if (ret)
+                return ret;
+
+        ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v);
+        if (ret)
+                return ret;
+
+        touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3);
+        touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2);
+
+        return 0;
+}
+
+static inline int start_tsi(struct da9034_touch *touch)
+{
+        return da903x_set_bits(touch->da9034_dev,
+                        DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
+}
+
+static inline int stop_tsi(struct da9034_touch *touch)
+{
+        return da903x_clr_bits(touch->da9034_dev,
+                        DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
+}
+
+static inline void report_pen_down(struct da9034_touch *touch)
+{
+        int x = touch->last_x;
+        int y = touch->last_y;
+
+        x &= 0xfff;
+        if (touch->x_inverted)
+                x = 1024 - x;
+        y &= 0xfff;
+        if (touch->y_inverted)
+                y = 1024 - y;
+
+        input_report_abs(touch->input_dev, ABS_X, x);
+        input_report_abs(touch->input_dev, ABS_Y, y);
+        input_report_key(touch->input_dev, BTN_TOUCH, 1);
+
+        input_sync(touch->input_dev);
+}
+
+static inline void report_pen_up(struct da9034_touch *touch)
+{
+        input_report_key(touch->input_dev, BTN_TOUCH, 0);
+        input_sync(touch->input_dev);
+}
+
+static void da9034_event_handler(struct da9034_touch *touch, int event)
+{
+        int err;
+
+        switch (touch->state) {
+        case STATE_IDLE:
+                if (event != EVENT_PEN_DOWN)
+                        break;
+
+                /* Enable auto measurement of the TSI, this will
+                 * automatically disable pen down detection
+                 */
+                err = start_tsi(touch);
+                if (err)
+                        goto err_reset;
+
+                touch->state = STATE_BUSY;
+                break;
+
+        case STATE_BUSY:
+                if (event != EVENT_TSI_READY)
+                        break;
+
+                err = read_tsi(touch);
+                if (err)
+                        goto err_reset;
+
+                /* Disable auto measurement of the TSI, so that
+                 * pen down status will be available
+                 */
+                err = stop_tsi(touch);
+                if (err)
+                        goto err_reset;
+
+                touch->state = STATE_STOP;
+                break;
+
+        case STATE_STOP:
+                if (event == EVENT_PEN_DOWN) {
+                        report_pen_down(touch);
+                        schedule_delayed_work(&touch->tsi_work,
+                                msecs_to_jiffies(touch->interval_ms));
+                        touch->state = STATE_WAIT;
+                }
+
+                if (event == EVENT_PEN_UP) {
+                        report_pen_up(touch);
+                        touch->state = STATE_IDLE;
+                }
+
+                input_sync(touch->input_dev);
+                break;
+
+        case STATE_WAIT:
+                if (event != EVENT_TIMEDOUT)
+                        break;
+
+                if (is_pen_down(touch)) {
+                        start_tsi(touch);
+                        touch->state = STATE_BUSY;
+                } else
+                        touch->state = STATE_IDLE;
+                break;
+        }
+        return;
+
+err_reset:
+        touch->state = STATE_IDLE;
+        stop_tsi(touch);
+        detect_pen_down(touch, 1);
+}
+
+static void da9034_tsi_work(struct work_struct *work)
+{
+        struct da9034_touch *touch =
+                container_of(work, struct da9034_touch, tsi_work.work);
+
+        da9034_event_handler(touch, EVENT_TIMEDOUT);
+}
+
+static int da9034_touch_notifier(struct notifier_block *nb,
+                                 unsigned long event, void *data)
+{
+        struct da9034_touch *touch =
+                container_of(nb, struct da9034_touch, notifier);
+
+        if (event & DA9034_EVENT_PEN_DOWN) {
+                if (is_pen_down(touch))
+                        da9034_event_handler(touch, EVENT_PEN_DOWN);
+                else
+                        da9034_event_handler(touch, EVENT_PEN_UP);
+        }
+
+        if (event & DA9034_EVENT_TSI_READY)
+                da9034_event_handler(touch, EVENT_TSI_READY);
+
+        return 0;
+}
+
+static int da9034_touch_open(struct input_dev *dev)
+{
+        struct da9034_touch *touch = input_get_drvdata(dev);
+        int ret;
+
+        ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier,
+                        DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
+        if (ret)
+                return -EBUSY;
+
+        /* Enable ADC LDO */
+        ret = da903x_set_bits(touch->da9034_dev,
+                        DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
+        if (ret)
+                return ret;
+
+        /* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */
+        ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b);
+        if (ret)
+                return ret;
+
+        ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00);
+        if (ret)
+                return ret;
+
+        touch->state = STATE_IDLE;
+        detect_pen_down(touch, 1);
+
+        return 0;
+}
+
+static void da9034_touch_close(struct input_dev *dev)
+{
+        struct da9034_touch *touch = input_get_drvdata(dev);
+
+        da903x_unregister_notifier(touch->da9034_dev, &touch->notifier,
+                        DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
+
+        cancel_delayed_work_sync(&touch->tsi_work);
+
+        touch->state = STATE_IDLE;
+        stop_tsi(touch);
+        detect_pen_down(touch, 0);
+
+        /* Disable ADC LDO */
+        da903x_clr_bits(touch->da9034_dev,
+                        DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
+}
+
+
+static int __devinit da9034_touch_probe(struct platform_device *pdev)
+{
+        struct da9034_touch_pdata *pdata = pdev->dev.platform_data;
+        struct da9034_touch *touch;
+        struct input_dev *input_dev;
+        int ret;
+
+        touch = kzalloc(sizeof(struct da9034_touch), GFP_KERNEL);
+        if (touch == NULL) {
+                dev_err(&pdev->dev, "failed to allocate driver data\n");
+                return -ENOMEM;
+        }
+
+        touch->da9034_dev = pdev->dev.parent;
+
+        if (pdata) {
+                touch->interval_ms      = pdata->interval_ms;
+                touch->x_inverted       = pdata->x_inverted;
+                touch->y_inverted       = pdata->y_inverted;
+        } else
+                /* fallback into default */
+                touch->interval_ms      = 10;
+
+        INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work);
+        touch->notifier.notifier_call = da9034_touch_notifier;
+
+        input_dev = input_allocate_device();
+        if (!input_dev) {
+                dev_err(&pdev->dev, "failed to allocate input device\n");
+                ret = -ENOMEM;
+                goto err_free_touch;
+        }
+
+        input_dev->name         = pdev->name;
+        input_dev->open         = da9034_touch_open;
+        input_dev->close        = da9034_touch_close;
+        input_dev->dev.parent   = &pdev->dev;
+
+        __set_bit(EV_ABS, input_dev->evbit);
+        __set_bit(ABS_X, input_dev->absbit);
+        __set_bit(ABS_Y, input_dev->absbit);
+        input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
+        input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
+
+        __set_bit(EV_KEY, input_dev->evbit);
+        __set_bit(BTN_TOUCH, input_dev->keybit);
+
+        touch->input_dev = input_dev;
+        input_set_drvdata(input_dev, touch);
+
+        ret = input_register_device(input_dev);
+        if (ret)
+                goto err_free_input;
+
+        platform_set_drvdata(pdev, touch);
+        return 0;
+
+err_free_input:
+        input_free_device(input_dev);
+err_free_touch:
+        kfree(touch);
+        return ret;
+}
+
+static int __devexit da9034_touch_remove(struct platform_device *pdev)
+{
+        struct da9034_touch *touch = platform_get_drvdata(pdev);
+
+        input_unregister_device(touch->input_dev);
+        kfree(touch);
+
+        return 0;
+}
+
+static struct platform_driver da9034_touch_driver = {
+        .driver = {
+                .name   = "da9034-touch",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = da9034_touch_probe,
+        .remove         = __devexit_p(da9034_touch_remove),
+};
+
+static int __init da9034_touch_init(void)
+{
+        return platform_driver_register(&da9034_touch_driver);
+}
+module_init(da9034_touch_init);
+
+static void __exit da9034_touch_exit(void)
+{
+        platform_driver_unregister(&da9034_touch_driver);
+}
+module_exit(da9034_touch_exit);
+
+MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034");
+MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9034-touch");