Input: add driver for Allwinner sunxi SoC's rtp controller

Note the sun4i-ts controller is capable of detecting a second touch, but
when a second touch is present then the accuracy becomes so bad the
reported touch location is not useable.

The original android driver contains some complicated heuristics using the
aprox. distance between the 2 touches to see if the user is making a pinch
open / close movement, and then reports emulated multi-touch events around
the last touch coordinate (as the dual-touch coordinates are worthless).

These kinds of heuristics are just asking for trouble (and don't belong in
the kernel). So this driver offers straight forward, reliable single touch
functionality only.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 262 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
new file mode 100644
index 000000000000..fc03a5fcd8f8
--- /dev/null
+++ b/drivers/input/touchscreen/sun4i-ts.c
@@ -0,0 +1,262 @@
+/*
+ * Allwinner sunxi resistive touchscreen controller driver
+ *
+ * Copyright (C) 2013 - 2014 Hans de Goede <hdegoede@redhat.com>
+ *
+ * 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.
+ */
+
+/*
+ * The sun4i-ts controller is capable of detecting a second touch, but when a
+ * second touch is present then the accuracy becomes so bad the reported touch
+ * location is not useable.
+ *
+ * The original android driver contains some complicated heuristics using the
+ * aprox. distance between the 2 touches to see if the user is making a pinch
+ * open / close movement, and then reports emulated multi-touch events around
+ * the last touch coordinate (as the dual-touch coordinates are worthless).
+ *
+ * These kinds of heuristics are just asking for trouble (and don't belong
+ * in the kernel). So this driver offers straight forward, reliable single
+ * touch functionality only.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define TP_CTRL0                0x00
+#define TP_CTRL1                0x04
+#define TP_CTRL2                0x08
+#define TP_CTRL3                0x0c
+#define TP_INT_FIFOC            0x10
+#define TP_INT_FIFOS            0x14
+#define TP_TPR                  0x18
+#define TP_CDAT                 0x1c
+#define TEMP_DATA               0x20
+#define TP_DATA                 0x24
+
+/* TP_CTRL0 bits */
+#define ADC_FIRST_DLY(x)        ((x) << 24) /* 8 bits */
+#define ADC_FIRST_DLY_MODE(x)   ((x) << 23)
+#define ADC_CLK_SEL(x)          ((x) << 22)
+#define ADC_CLK_DIV(x)          ((x) << 20) /* 3 bits */
+#define FS_DIV(x)               ((x) << 16) /* 4 bits */
+#define T_ACQ(x)                ((x) << 0) /* 16 bits */
+
+/* TP_CTRL1 bits */
+#define STYLUS_UP_DEBOUN(x)     ((x) << 12) /* 8 bits */
+#define STYLUS_UP_DEBOUN_EN(x)  ((x) << 9)
+#define TOUCH_PAN_CALI_EN(x)    ((x) << 6)
+#define TP_DUAL_EN(x)           ((x) << 5)
+#define TP_MODE_EN(x)           ((x) << 4)
+#define TP_ADC_SELECT(x)        ((x) << 3)
+#define ADC_CHAN_SELECT(x)      ((x) << 0)  /* 3 bits */
+
+/* TP_CTRL2 bits */
+#define TP_SENSITIVE_ADJUST(x)  ((x) << 28) /* 4 bits */
+#define TP_MODE_SELECT(x)       ((x) << 26) /* 2 bits */
+#define PRE_MEA_EN(x)           ((x) << 24)
+#define PRE_MEA_THRE_CNT(x)     ((x) << 0) /* 24 bits */
+
+/* TP_CTRL3 bits */
+#define FILTER_EN(x)            ((x) << 2)
+#define FILTER_TYPE(x)          ((x) << 0)  /* 2 bits */
+
+/* TP_INT_FIFOC irq and fifo mask / control bits */
+#define TEMP_IRQ_EN(x)          ((x) << 18)
+#define OVERRUN_IRQ_EN(x)       ((x) << 17)
+#define DATA_IRQ_EN(x)          ((x) << 16)
+#define TP_DATA_XY_CHANGE(x)    ((x) << 13)
+#define FIFO_TRIG(x)            ((x) << 8)  /* 5 bits */
+#define DATA_DRQ_EN(x)          ((x) << 7)
+#define FIFO_FLUSH(x)           ((x) << 4)
+#define TP_UP_IRQ_EN(x)         ((x) << 1)
+#define TP_DOWN_IRQ_EN(x)       ((x) << 0)
+
+/* TP_INT_FIFOS irq and fifo status bits */
+#define TEMP_DATA_PENDING       BIT(18)
+#define FIFO_OVERRUN_PENDING    BIT(17)
+#define FIFO_DATA_PENDING       BIT(16)
+#define TP_IDLE_FLG             BIT(2)
+#define TP_UP_PENDING           BIT(1)
+#define TP_DOWN_PENDING         BIT(0)
+
+/* TP_TPR bits */
+#define TEMP_ENABLE(x)          ((x) << 16)
+#define TEMP_PERIOD(x)          ((x) << 0)  /* t = x * 256 * 16 / clkin */
+
+struct sun4i_ts_data {
+        struct device *dev;
+        struct input_dev *input;
+        void __iomem *base;
+        unsigned int irq;
+        bool ignore_fifo_data;
+};
+
+static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
+{
+        struct sun4i_ts_data *ts = dev_id;
+        u32 reg_val, x, y;
+
+        reg_val  = readl(ts->base + TP_INT_FIFOS);
+
+        if (reg_val & FIFO_DATA_PENDING) {
+                x = readl(ts->base + TP_DATA);
+                y = readl(ts->base + TP_DATA);
+                /* The 1st location reported after an up event is unreliable */
+                if (!ts->ignore_fifo_data) {
+                        input_report_abs(ts->input, ABS_X, x);
+                        input_report_abs(ts->input, ABS_Y, y);
+                        /*
+                         * The hardware has a separate down status bit, but
+                         * that gets set before we get the first location,
+                         * resulting in reporting a click on the old location.
+                         */
+                        input_report_key(ts->input, BTN_TOUCH, 1);
+                        input_sync(ts->input);
+                } else {
+                        ts->ignore_fifo_data = false;
+                }
+        }
+
+        if (reg_val & TP_UP_PENDING) {
+                ts->ignore_fifo_data = true;
+                input_report_key(ts->input, BTN_TOUCH, 0);
+                input_sync(ts->input);
+        }
+
+        writel(reg_val, ts->base + TP_INT_FIFOS);
+
+        return IRQ_HANDLED;
+}
+
+static int sun4i_ts_open(struct input_dev *dev)
+{
+        struct sun4i_ts_data *ts = input_get_drvdata(dev);
+
+        /* Flush, set trig level to 1, enable data and up irqs */
+        writel(DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | TP_UP_IRQ_EN(1),
+               ts->base + TP_INT_FIFOC);
+
+        return 0;
+}
+
+static void sun4i_ts_close(struct input_dev *dev)
+{
+        struct sun4i_ts_data *ts = input_get_drvdata(dev);
+
+        /* Deactivate all IRQs */
+        writel(0, ts->base + TP_INT_FIFOC);
+}
+
+static int sun4i_ts_probe(struct platform_device *pdev)
+{
+        struct sun4i_ts_data *ts;
+        struct device *dev = &pdev->dev;
+        int error;
+
+        ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL);
+        if (!ts)
+                return -ENOMEM;
+
+        ts->dev = dev;
+        ts->ignore_fifo_data = true;
+
+        ts->input = devm_input_allocate_device(dev);
+        if (!ts->input)
+                return -ENOMEM;
+
+        ts->input->name = pdev->name;
+        ts->input->phys = "sun4i_ts/input0";
+        ts->input->open = sun4i_ts_open;
+        ts->input->close = sun4i_ts_close;
+        ts->input->id.bustype = BUS_HOST;
+        ts->input->id.vendor = 0x0001;
+        ts->input->id.product = 0x0001;
+        ts->input->id.version = 0x0100;
+        ts->input->evbit[0] =  BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
+        __set_bit(BTN_TOUCH, ts->input->keybit);
+        input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0);
+        input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0);
+        input_set_drvdata(ts->input, ts);
+
+        ts->base = devm_ioremap_resource(dev,
+                              platform_get_resource(pdev, IORESOURCE_MEM, 0));
+        if (IS_ERR(ts->base))
+                return PTR_ERR(ts->base);
+
+        ts->irq = platform_get_irq(pdev, 0);
+        error = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts);
+        if (error)
+                return error;
+
+        /*
+         * Select HOSC clk, clkin = clk / 6, adc samplefreq = clkin / 8192,
+         * t_acq = clkin / (16 * 64)
+         */
+        writel(ADC_CLK_SEL(0) | ADC_CLK_DIV(2) | FS_DIV(7) | T_ACQ(63),
+               ts->base + TP_CTRL0);
+
+        /*
+         * sensitive_adjust = 15 : max, which is not all that sensitive,
+         * tp_mode = 0 : only x and y coordinates, as we don't use dual touch
+         */
+        writel(TP_SENSITIVE_ADJUST(15) | TP_MODE_SELECT(0),
+               ts->base + TP_CTRL2);
+
+        /* Enable median filter, type 1 : 5/3 */
+        writel(FILTER_EN(1) | FILTER_TYPE(1), ts->base + TP_CTRL3);
+
+        /* Enable temperature measurement, period 1953 (2 seconds) */
+        writel(TEMP_ENABLE(1) | TEMP_PERIOD(1953), ts->base + TP_TPR);
+
+        /*
+         * Set stylus up debounce to aprox 10 ms, enable debounce, and
+         * finally enable tp mode.
+         */
+        writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1),
+               ts->base + TP_CTRL1);
+
+        error = input_register_device(ts->input);
+        if (error)
+                return error;
+
+        platform_set_drvdata(pdev, ts);
+        return 0;
+}
+
+static const struct of_device_id sun4i_ts_of_match[] = {
+        { .compatible = "allwinner,sun4i-a10-ts", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sun4i_ts_of_match);
+
+static struct platform_driver sun4i_ts_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "sun4i-ts",
+                .of_match_table = of_match_ptr(sun4i_ts_of_match),
+        },
+        .probe  = sun4i_ts_probe,
+};
+
+module_platform_driver(sun4i_ts_driver);
+
+MODULE_DESCRIPTION("Allwinner sun4i resistive touchscreen controller driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");