+++ /dev/null
-From afbd58e1b1219cbcbe2cc07273fc51f658891e9b Mon Sep 17 00:00:00 2001
-From: Hans de Goede <hdegoede@redhat.com>
-Date: Mon, 23 Dec 2013 16:21:02 +0100
-Subject: [PATCH] input: Add new sun4i-ts 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>
----
- .../bindings/input/touchscreen/sun4i.txt | 15 ++
- drivers/input/touchscreen/Kconfig | 10 +
- drivers/input/touchscreen/Makefile | 1 +
- drivers/input/touchscreen/sun4i-ts.c | 262 +++++++++++++++++++++
- 4 files changed, 288 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
- create mode 100644 drivers/input/touchscreen/sun4i-ts.c
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
-@@ -0,0 +1,15 @@
-+sun4i resistive touchscreen controller
-+--------------------------------------
-+
-+Required properties:
-+ - compatible: "allwinner,sun4i-ts"
-+ - reg: mmio address range of the chip
-+ - interrupts: interrupt to which the chip is connected
-+
-+Example:
-+
-+ rtp: rtp@01c25000 {
-+ compatible = "allwinner,sun4i-ts";
-+ reg = <0x01c25000 0x100>;
-+ interrupts = <29>;
-+ };
---- a/drivers/input/touchscreen/Kconfig
-+++ b/drivers/input/touchscreen/Kconfig
-@@ -906,6 +906,16 @@ config TOUCHSCREEN_STMPE
- To compile this driver as a module, choose M here: the
- module will be called stmpe-ts.
-
-+config TOUCHSCREEN_SUN4I
-+ tristate "Allwinner sun4i resistive touchscreen controller support"
-+ depends on ARCH_SUNXI
-+ help
-+ This selects support for the resistive touchscreen controller
-+ found on Allwinner sunxi SoCs.
-+
-+ To compile this driver as a module, choose M here: the
-+ module will be called sun4i-ts.
-+
- config TOUCHSCREEN_SUR40
- tristate "Samsung SUR40 (Surface 2.0/PixelSense) touchscreen"
- depends on USB
---- a/drivers/input/touchscreen/Makefile
-+++ b/drivers/input/touchscreen/Makefile
-@@ -54,6 +54,7 @@ obj-$(CONFIG_TOUCHSCREEN_PIXCIR) += pixc
- obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
- obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
- obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
-+obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
- obj-$(CONFIG_TOUCHSCREEN_SUR40) += sur40.o
- obj-$(CONFIG_TOUCHSCREEN_TI_AM335X_TSC) += ti_am335x_tsc.o
- obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
---- /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 ret;
-+
-+ 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);
-+ ret = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts);
-+ if (ret)
-+ return ret;
-+
-+ /*
-+ * 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);
-+
-+ ret = input_register_device(ts->input);
-+ if (ret)
-+ return ret;
-+
-+ platform_set_drvdata(pdev, ts);
-+ return 0;
-+}
-+
-+static const struct of_device_id sun4i_ts_of_match[] = {
-+ { .compatible = "allwinner,sun4i-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");
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