--- /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
+
+diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
+new file mode 100644
+index 0000000..e45927e
+--- /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>;
++ };
+diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
+index 07e9e82..f4c5ca3 100644
+--- 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
+diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
+index 62801f2..c8f7375 100644
+--- a/drivers/input/touchscreen/Makefile
++++ b/drivers/input/touchscreen/Makefile
+@@ -54,6 +54,7 @@ obj-$(CONFIG_TOUCHSCREEN_PIXCIR) += pixcir_i2c_ts.o
+ obj-$(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
+diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
+new file mode 100644
+index 0000000..5945219
+--- /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");
+--
+2.0.3
+
projects / openwrt / openwrt.git / blobdiff