Input: add LPC32xx touchscreen controller driver

This patch set introduces support for the LPC32xx touchscreen
controller driver. The LPC32xx touchscreen controller supports
automated event detection and X/Y data conversion for resistive
touchscreens.

Signed-off-by: Kevin Wells <wellsk40@gmail.com>
Signed-off-by: Durgesh Pattamatta <durgesh.pattamatta@nxp.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 422 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 0069d9703fda..400c99de0bb3 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -214,6 +214,16 @@ config TOUCHSCREEN_WACOM_W8001
           To compile this driver as a module, choose M here: the
           module will be called wacom_w8001.
 
+config TOUCHSCREEN_LPC32XX
+        tristate "LPC32XX touchscreen controller"
+        depends on ARCH_LPC32XX
+        help
+          Say Y here if you have a LPC32XX device and want
+          to support the built-in touchscreen.
+
+          To compile this driver as a module, choose M here: the
+          module will be called lpc32xx_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 28217e1dcafd..22e2d598dc69 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI)		+= eeti_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ELO)           += elo.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)       += fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_INEXIO)        += inexio.o
+obj-$(CONFIG_TOUCHSCREEN_LPC32XX)       += lpc32xx_ts.o
 obj-$(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/lpc32xx_ts.c b/drivers/input/touchscreen/lpc32xx_ts.c
new file mode 100644
index 000000000000..dcf803f5a1f7
--- /dev/null
+++ b/drivers/input/touchscreen/lpc32xx_ts.c
@@ -0,0 +1,411 @@
+/*
+ * LPC32xx built-in touchscreen driver
+ *
+ * Copyright (C) 2010 NXP Semiconductors
+ *
+ * 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, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+/*
+ * Touchscreen controller register offsets
+ */
+#define LPC32XX_TSC_STAT                        0x00
+#define LPC32XX_TSC_SEL                         0x04
+#define LPC32XX_TSC_CON                         0x08
+#define LPC32XX_TSC_FIFO                        0x0C
+#define LPC32XX_TSC_DTR                         0x10
+#define LPC32XX_TSC_RTR                         0x14
+#define LPC32XX_TSC_UTR                         0x18
+#define LPC32XX_TSC_TTR                         0x1C
+#define LPC32XX_TSC_DXP                         0x20
+#define LPC32XX_TSC_MIN_X                       0x24
+#define LPC32XX_TSC_MAX_X                       0x28
+#define LPC32XX_TSC_MIN_Y                       0x2C
+#define LPC32XX_TSC_MAX_Y                       0x30
+#define LPC32XX_TSC_AUX_UTR                     0x34
+#define LPC32XX_TSC_AUX_MIN                     0x38
+#define LPC32XX_TSC_AUX_MAX                     0x3C
+
+#define LPC32XX_TSC_STAT_FIFO_OVRRN             (1 << 8)
+#define LPC32XX_TSC_STAT_FIFO_EMPTY             (1 << 7)
+
+#define LPC32XX_TSC_SEL_DEFVAL                  0x0284
+
+#define LPC32XX_TSC_ADCCON_IRQ_TO_FIFO_4        (0x1 << 11)
+#define LPC32XX_TSC_ADCCON_X_SAMPLE_SIZE(s)     ((10 - (s)) << 7)
+#define LPC32XX_TSC_ADCCON_Y_SAMPLE_SIZE(s)     ((10 - (s)) << 4)
+#define LPC32XX_TSC_ADCCON_POWER_UP             (1 << 2)
+#define LPC32XX_TSC_ADCCON_AUTO_EN              (1 << 0)
+
+#define LPC32XX_TSC_FIFO_TS_P_LEVEL             (1 << 31)
+#define LPC32XX_TSC_FIFO_NORMALIZE_X_VAL(x)     (((x) & 0x03FF0000) >> 16)
+#define LPC32XX_TSC_FIFO_NORMALIZE_Y_VAL(y)     ((y) & 0x000003FF)
+
+#define LPC32XX_TSC_ADCDAT_VALUE_MASK           0x000003FF
+
+#define LPC32XX_TSC_MIN_XY_VAL                  0x0
+#define LPC32XX_TSC_MAX_XY_VAL                  0x3FF
+
+#define MOD_NAME "ts-lpc32xx"
+
+#define tsc_readl(dev, reg) \
+        __raw_readl((dev)->tsc_base + (reg))
+#define tsc_writel(dev, reg, val) \
+        __raw_writel((val), (dev)->tsc_base + (reg))
+
+struct lpc32xx_tsc {
+        struct input_dev *dev;
+        void __iomem *tsc_base;
+        int irq;
+        struct clk *clk;
+};
+
+static void lpc32xx_fifo_clear(struct lpc32xx_tsc *tsc)
+{
+        while (!(tsc_readl(tsc, LPC32XX_TSC_STAT) &
+                        LPC32XX_TSC_STAT_FIFO_EMPTY))
+                tsc_readl(tsc, LPC32XX_TSC_FIFO);
+}
+
+static irqreturn_t lpc32xx_ts_interrupt(int irq, void *dev_id)
+{
+        u32 tmp, rv[4], xs[4], ys[4];
+        int idx;
+        struct lpc32xx_tsc *tsc = dev_id;
+        struct input_dev *input = tsc->dev;
+
+        tmp = tsc_readl(tsc, LPC32XX_TSC_STAT);
+
+        if (tmp & LPC32XX_TSC_STAT_FIFO_OVRRN) {
+                /* FIFO overflow - throw away samples */
+                lpc32xx_fifo_clear(tsc);
+                return IRQ_HANDLED;
+        }
+
+        /*
+         * Gather and normalize 4 samples. Pen-up events may have less
+         * than 4 samples, but its ok to pop 4 and let the last sample
+         * pen status check drop the samples.
+         */
+        idx = 0;
+        while (idx < 4 &&
+               !(tsc_readl(tsc, LPC32XX_TSC_STAT) &
+                        LPC32XX_TSC_STAT_FIFO_EMPTY)) {
+                tmp = tsc_readl(tsc, LPC32XX_TSC_FIFO);
+                xs[idx] = LPC32XX_TSC_ADCDAT_VALUE_MASK -
+                        LPC32XX_TSC_FIFO_NORMALIZE_X_VAL(tmp);
+                ys[idx] = LPC32XX_TSC_ADCDAT_VALUE_MASK -
+                        LPC32XX_TSC_FIFO_NORMALIZE_Y_VAL(tmp);
+                rv[idx] = tmp;
+                idx++;
+        }
+
+        /* Data is only valid if pen is still down in last sample */
+        if (!(rv[3] & LPC32XX_TSC_FIFO_TS_P_LEVEL) && idx == 4) {
+                /* Use average of 2nd and 3rd sample for position */
+                input_report_abs(input, ABS_X, (xs[1] + xs[2]) / 2);
+                input_report_abs(input, ABS_Y, (ys[1] + ys[2]) / 2);
+                input_report_key(input, BTN_TOUCH, 1);
+        } else {
+                input_report_key(input, BTN_TOUCH, 0);
+        }
+
+        input_sync(input);
+
+        return IRQ_HANDLED;
+}
+
+static void lpc32xx_stop_tsc(struct lpc32xx_tsc *tsc)
+{
+        /* Disable auto mode */
+        tsc_writel(tsc, LPC32XX_TSC_CON,
+                   tsc_readl(tsc, LPC32XX_TSC_CON) &
+                             ~LPC32XX_TSC_ADCCON_AUTO_EN);
+
+        clk_disable(tsc->clk);
+}
+
+static void lpc32xx_setup_tsc(struct lpc32xx_tsc *tsc)
+{
+        u32 tmp;
+
+        clk_enable(tsc->clk);
+
+        tmp = tsc_readl(tsc, LPC32XX_TSC_CON) & ~LPC32XX_TSC_ADCCON_POWER_UP;
+
+        /* Set the TSC FIFO depth to 4 samples @ 10-bits per sample (max) */
+        tmp = LPC32XX_TSC_ADCCON_IRQ_TO_FIFO_4 |
+              LPC32XX_TSC_ADCCON_X_SAMPLE_SIZE(10) |
+              LPC32XX_TSC_ADCCON_Y_SAMPLE_SIZE(10);
+        tsc_writel(tsc, LPC32XX_TSC_CON, tmp);
+
+        /* These values are all preset */
+        tsc_writel(tsc, LPC32XX_TSC_SEL, LPC32XX_TSC_SEL_DEFVAL);
+        tsc_writel(tsc, LPC32XX_TSC_MIN_X, LPC32XX_TSC_MIN_XY_VAL);
+        tsc_writel(tsc, LPC32XX_TSC_MAX_X, LPC32XX_TSC_MAX_XY_VAL);
+        tsc_writel(tsc, LPC32XX_TSC_MIN_Y, LPC32XX_TSC_MIN_XY_VAL);
+        tsc_writel(tsc, LPC32XX_TSC_MAX_Y, LPC32XX_TSC_MAX_XY_VAL);
+
+        /* Aux support is not used */
+        tsc_writel(tsc, LPC32XX_TSC_AUX_UTR, 0);
+        tsc_writel(tsc, LPC32XX_TSC_AUX_MIN, 0);
+        tsc_writel(tsc, LPC32XX_TSC_AUX_MAX, 0);
+
+        /*
+         * Set sample rate to about 240Hz per X/Y pair. A single measurement
+         * consists of 4 pairs which gives about a 60Hz sample rate based on
+         * a stable 32768Hz clock source. Values are in clocks.
+         * Rate is (32768 / (RTR + XCONV + RTR + YCONV + DXP + TTR + UTR) / 4
+         */
+        tsc_writel(tsc, LPC32XX_TSC_RTR, 0x2);
+        tsc_writel(tsc, LPC32XX_TSC_DTR, 0x2);
+        tsc_writel(tsc, LPC32XX_TSC_TTR, 0x10);
+        tsc_writel(tsc, LPC32XX_TSC_DXP, 0x4);
+        tsc_writel(tsc, LPC32XX_TSC_UTR, 88);
+
+        lpc32xx_fifo_clear(tsc);
+
+        /* Enable automatic ts event capture */
+        tsc_writel(tsc, LPC32XX_TSC_CON, tmp | LPC32XX_TSC_ADCCON_AUTO_EN);
+}
+
+static int lpc32xx_ts_open(struct input_dev *dev)
+{
+        struct lpc32xx_tsc *tsc = input_get_drvdata(dev);
+
+        lpc32xx_setup_tsc(tsc);
+
+        return 0;
+}
+
+static void lpc32xx_ts_close(struct input_dev *dev)
+{
+        struct lpc32xx_tsc *tsc = input_get_drvdata(dev);
+
+        lpc32xx_stop_tsc(tsc);
+}
+
+static int __devinit lpc32xx_ts_probe(struct platform_device *pdev)
+{
+        struct lpc32xx_tsc *tsc;
+        struct input_dev *input;
+        struct resource *res;
+        resource_size_t size;
+        int irq;
+        int error;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "Can't get memory resource\n");
+                return -ENOENT;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "Can't get interrupt resource\n");
+                return irq;
+        }
+
+        tsc = kzalloc(sizeof(*tsc), GFP_KERNEL);
+        input = input_allocate_device();
+        if (!tsc || !input) {
+                dev_err(&pdev->dev, "failed allocating memory\n");
+                error = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        tsc->dev = input;
+        tsc->irq = irq;
+
+        size = resource_size(res);
+
+        if (!request_mem_region(res->start, size, pdev->name)) {
+                dev_err(&pdev->dev, "TSC registers are not free\n");
+                error = -EBUSY;
+                goto err_free_mem;
+        }
+
+        tsc->tsc_base = ioremap(res->start, size);
+        if (!tsc->tsc_base) {
+                dev_err(&pdev->dev, "Can't map memory\n");
+                error = -ENOMEM;
+                goto err_release_mem;
+        }
+
+        tsc->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(tsc->clk)) {
+                dev_err(&pdev->dev, "failed getting clock\n");
+                error = PTR_ERR(tsc->clk);
+                goto err_unmap;
+        }
+
+        input->name = MOD_NAME;
+        input->phys = "lpc32xx/input0";
+        input->id.bustype = BUS_HOST;
+        input->id.vendor = 0x0001;
+        input->id.product = 0x0002;
+        input->id.version = 0x0100;
+        input->dev.parent = &pdev->dev;
+        input->open = lpc32xx_ts_open;
+        input->close = lpc32xx_ts_close;
+
+        input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+        input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+        input_set_abs_params(input, ABS_X, LPC32XX_TSC_MIN_XY_VAL,
+                             LPC32XX_TSC_MAX_XY_VAL, 0, 0);
+        input_set_abs_params(input, ABS_Y, LPC32XX_TSC_MIN_XY_VAL,
+                             LPC32XX_TSC_MAX_XY_VAL, 0, 0);
+
+        input_set_drvdata(input, tsc);
+
+        error = request_irq(tsc->irq, lpc32xx_ts_interrupt,
+                            IRQF_DISABLED, pdev->name, tsc);
+        if (error) {
+                dev_err(&pdev->dev, "failed requesting interrupt\n");
+                goto err_put_clock;
+        }
+
+        error = input_register_device(input);
+        if (error) {
+                dev_err(&pdev->dev, "failed registering input device\n");
+                goto err_free_irq;
+        }
+
+        platform_set_drvdata(pdev, tsc);
+        device_init_wakeup(&pdev->dev, 1);
+
+        return 0;
+
+err_free_irq:
+        free_irq(tsc->irq, tsc);
+err_put_clock:
+        clk_put(tsc->clk);
+err_unmap:
+        iounmap(tsc->tsc_base);
+err_release_mem:
+        release_mem_region(res->start, size);
+err_free_mem:
+        input_free_device(input);
+        kfree(tsc);
+
+        return error;
+}
+
+static int __devexit lpc32xx_ts_remove(struct platform_device *pdev)
+{
+        struct lpc32xx_tsc *tsc = platform_get_drvdata(pdev);
+        struct resource *res;
+
+        device_init_wakeup(&pdev->dev, 0);
+        free_irq(tsc->irq, tsc);
+
+        input_unregister_device(tsc->dev);
+
+        clk_put(tsc->clk);
+
+        iounmap(tsc->tsc_base);
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(res->start, resource_size(res));
+
+        kfree(tsc);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int lpc32xx_ts_suspend(struct device *dev)
+{
+        struct lpc32xx_tsc *tsc = dev_get_drvdata(dev);
+        struct input_dev *input = tsc->dev;
+
+        /*
+         * Suspend and resume can be called when the device hasn't been
+         * enabled. If there are no users that have the device open, then
+         * avoid calling the TSC stop and start functions as the TSC
+         * isn't yet clocked.
+         */
+        mutex_lock(&input->mutex);
+
+        if (input->users) {
+                if (device_may_wakeup(dev))
+                        enable_irq_wake(tsc->irq);
+                else
+                        lpc32xx_stop_tsc(tsc);
+        }
+
+        mutex_unlock(&input->mutex);
+
+        return 0;
+}
+
+static int lpc32xx_ts_resume(struct device *dev)
+{
+        struct lpc32xx_tsc *tsc = dev_get_drvdata(dev);
+        struct input_dev *input = tsc->dev;
+
+        mutex_lock(&input->mutex);
+
+        if (input->users) {
+                if (device_may_wakeup(dev))
+                        disable_irq_wake(tsc->irq);
+                else
+                        lpc32xx_setup_tsc(tsc);
+        }
+
+        mutex_unlock(&input->mutex);
+
+        return 0;
+}
+
+static const struct dev_pm_ops lpc32xx_ts_pm_ops = {
+        .suspend        = lpc32xx_ts_suspend,
+        .resume         = lpc32xx_ts_resume,
+};
+#define LPC32XX_TS_PM_OPS (&lpc32xx_ts_pm_ops)
+#else
+#define LPC32XX_TS_PM_OPS NULL
+#endif
+
+static struct platform_driver lpc32xx_ts_driver = {
+        .probe          = lpc32xx_ts_probe,
+        .remove         = __devexit_p(lpc32xx_ts_remove),
+        .driver         = {
+                .name   = MOD_NAME,
+                .owner  = THIS_MODULE,
+                .pm     = LPC32XX_TS_PM_OPS,
+        },
+};
+
+static int __init lpc32xx_ts_init(void)
+{
+        return platform_driver_register(&lpc32xx_ts_driver);
+}
+module_init(lpc32xx_ts_init);
+
+static void __exit lpc32xx_ts_exit(void)
+{
+        platform_driver_unregister(&lpc32xx_ts_driver);
+}
+module_exit(lpc32xx_ts_exit);
+
+MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com");
+MODULE_DESCRIPTION("LPC32XX TSC Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lpc32xx_ts");