mirror of https://github.com/hak5/openwrt-owl.git
355 lines
11 KiB
Diff
355 lines
11 KiB
Diff
From 328d21d9c56ddca56ed80b1595066b1621f6926b Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Mon, 23 Dec 2013 16:21:02 +0100
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Subject: [PATCH] input: Add new sun4i-ts driver for Allwinner sunxi SoC's rtp
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controller
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Note the sun4i-ts controller is capable of detecting a second touch, but when
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a second touch is present then the accuracy becomes so bad the reported touch
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location is not useable.
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The original android driver contains some complicated heuristics using the
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aprox. distance between the 2 touches to see if the user is making a pinch
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open / close movement, and then reports emulated multi-touch events around
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the last touch coordinate (as the dual-touch coordinates are worthless).
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These kinds of heuristics are just asking for trouble (and don't belong
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in the kernel). So this driver offers straight forward, reliable single
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touch functionality only.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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.../bindings/input/touchscreen/sun4i.txt | 15 ++
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drivers/input/touchscreen/Kconfig | 10 +
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drivers/input/touchscreen/Makefile | 1 +
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drivers/input/touchscreen/sun4i-ts.c | 262 +++++++++++++++++++++
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4 files changed, 288 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
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create mode 100644 drivers/input/touchscreen/sun4i-ts.c
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diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
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new file mode 100644
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index 0000000..e45927e
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
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@@ -0,0 +1,15 @@
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+sun4i resistive touchscreen controller
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+--------------------------------------
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+
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+Required properties:
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+ - compatible: "allwinner,sun4i-ts"
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+ - reg: mmio address range of the chip
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+ - interrupts: interrupt to which the chip is connected
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+
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+Example:
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+
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+ rtp: rtp@01c25000 {
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+ compatible = "allwinner,sun4i-ts";
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+ reg = <0x01c25000 0x100>;
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+ interrupts = <29>;
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+ };
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diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
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index 07e9e82..f4c5ca3 100644
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--- a/drivers/input/touchscreen/Kconfig
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+++ b/drivers/input/touchscreen/Kconfig
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@@ -906,6 +906,16 @@ config TOUCHSCREEN_STMPE
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To compile this driver as a module, choose M here: the
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module will be called stmpe-ts.
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+config TOUCHSCREEN_SUN4I
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+ tristate "Allwinner sun4i resistive touchscreen controller support"
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+ depends on ARCH_SUNXI
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+ help
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+ This selects support for the resistive touchscreen controller
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+ found on Allwinner sunxi SoCs.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called sun4i-ts.
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+
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config TOUCHSCREEN_SUR40
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tristate "Samsung SUR40 (Surface 2.0/PixelSense) touchscreen"
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depends on USB
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diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
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index 62801f2..c8f7375 100644
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--- a/drivers/input/touchscreen/Makefile
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+++ b/drivers/input/touchscreen/Makefile
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@@ -54,6 +54,7 @@ obj-$(CONFIG_TOUCHSCREEN_PIXCIR) += pixcir_i2c_ts.o
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obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
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obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
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obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
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+obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
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obj-$(CONFIG_TOUCHSCREEN_SUR40) += sur40.o
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obj-$(CONFIG_TOUCHSCREEN_TI_AM335X_TSC) += ti_am335x_tsc.o
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obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
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diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
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new file mode 100644
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index 0000000..5945219
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--- /dev/null
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+++ b/drivers/input/touchscreen/sun4i-ts.c
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@@ -0,0 +1,262 @@
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+/*
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+ * Allwinner sunxi resistive touchscreen controller driver
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+ *
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+ * Copyright (C) 2013 - 2014 Hans de Goede <hdegoede@redhat.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+/*
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+ * The sun4i-ts controller is capable of detecting a second touch, but when a
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+ * second touch is present then the accuracy becomes so bad the reported touch
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+ * location is not useable.
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+ *
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+ * The original android driver contains some complicated heuristics using the
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+ * aprox. distance between the 2 touches to see if the user is making a pinch
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+ * open / close movement, and then reports emulated multi-touch events around
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+ * the last touch coordinate (as the dual-touch coordinates are worthless).
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+ *
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+ * These kinds of heuristics are just asking for trouble (and don't belong
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+ * in the kernel). So this driver offers straight forward, reliable single
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+ * touch functionality only.
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+ */
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+
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+#include <linux/err.h>
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+#include <linux/init.h>
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+#include <linux/input.h>
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+#include <linux/interrupt.h>
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+#include <linux/io.h>
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+#include <linux/module.h>
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+#include <linux/of_platform.h>
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+#include <linux/platform_device.h>
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+#include <linux/slab.h>
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+
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+#define TP_CTRL0 0x00
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+#define TP_CTRL1 0x04
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+#define TP_CTRL2 0x08
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+#define TP_CTRL3 0x0c
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+#define TP_INT_FIFOC 0x10
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+#define TP_INT_FIFOS 0x14
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+#define TP_TPR 0x18
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+#define TP_CDAT 0x1c
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+#define TEMP_DATA 0x20
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+#define TP_DATA 0x24
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+
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+/* TP_CTRL0 bits */
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+#define ADC_FIRST_DLY(x) ((x) << 24) /* 8 bits */
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+#define ADC_FIRST_DLY_MODE(x) ((x) << 23)
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+#define ADC_CLK_SEL(x) ((x) << 22)
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+#define ADC_CLK_DIV(x) ((x) << 20) /* 3 bits */
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+#define FS_DIV(x) ((x) << 16) /* 4 bits */
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+#define T_ACQ(x) ((x) << 0) /* 16 bits */
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+
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+/* TP_CTRL1 bits */
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+#define STYLUS_UP_DEBOUN(x) ((x) << 12) /* 8 bits */
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+#define STYLUS_UP_DEBOUN_EN(x) ((x) << 9)
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+#define TOUCH_PAN_CALI_EN(x) ((x) << 6)
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+#define TP_DUAL_EN(x) ((x) << 5)
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+#define TP_MODE_EN(x) ((x) << 4)
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+#define TP_ADC_SELECT(x) ((x) << 3)
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+#define ADC_CHAN_SELECT(x) ((x) << 0) /* 3 bits */
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+
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+/* TP_CTRL2 bits */
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+#define TP_SENSITIVE_ADJUST(x) ((x) << 28) /* 4 bits */
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+#define TP_MODE_SELECT(x) ((x) << 26) /* 2 bits */
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+#define PRE_MEA_EN(x) ((x) << 24)
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+#define PRE_MEA_THRE_CNT(x) ((x) << 0) /* 24 bits */
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+
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+/* TP_CTRL3 bits */
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+#define FILTER_EN(x) ((x) << 2)
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+#define FILTER_TYPE(x) ((x) << 0) /* 2 bits */
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+
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+/* TP_INT_FIFOC irq and fifo mask / control bits */
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+#define TEMP_IRQ_EN(x) ((x) << 18)
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+#define OVERRUN_IRQ_EN(x) ((x) << 17)
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+#define DATA_IRQ_EN(x) ((x) << 16)
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+#define TP_DATA_XY_CHANGE(x) ((x) << 13)
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+#define FIFO_TRIG(x) ((x) << 8) /* 5 bits */
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+#define DATA_DRQ_EN(x) ((x) << 7)
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+#define FIFO_FLUSH(x) ((x) << 4)
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+#define TP_UP_IRQ_EN(x) ((x) << 1)
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+#define TP_DOWN_IRQ_EN(x) ((x) << 0)
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+
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+/* TP_INT_FIFOS irq and fifo status bits */
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+#define TEMP_DATA_PENDING BIT(18)
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+#define FIFO_OVERRUN_PENDING BIT(17)
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+#define FIFO_DATA_PENDING BIT(16)
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+#define TP_IDLE_FLG BIT(2)
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+#define TP_UP_PENDING BIT(1)
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+#define TP_DOWN_PENDING BIT(0)
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+
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+/* TP_TPR bits */
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+#define TEMP_ENABLE(x) ((x) << 16)
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+#define TEMP_PERIOD(x) ((x) << 0) /* t = x * 256 * 16 / clkin */
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+
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+struct sun4i_ts_data {
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+ struct device *dev;
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+ struct input_dev *input;
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+ void __iomem *base;
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+ unsigned int irq;
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+ bool ignore_fifo_data;
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+};
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+
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+static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
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+{
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+ struct sun4i_ts_data *ts = dev_id;
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+ u32 reg_val, x, y;
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+
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+ reg_val = readl(ts->base + TP_INT_FIFOS);
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+
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+ if (reg_val & FIFO_DATA_PENDING) {
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+ x = readl(ts->base + TP_DATA);
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+ y = readl(ts->base + TP_DATA);
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+ /* The 1st location reported after an up event is unreliable */
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+ if (!ts->ignore_fifo_data) {
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+ input_report_abs(ts->input, ABS_X, x);
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+ input_report_abs(ts->input, ABS_Y, y);
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+ /*
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+ * The hardware has a separate down status bit, but
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+ * that gets set before we get the first location,
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+ * resulting in reporting a click on the old location.
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+ */
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+ input_report_key(ts->input, BTN_TOUCH, 1);
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+ input_sync(ts->input);
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+ } else {
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+ ts->ignore_fifo_data = false;
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+ }
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+ }
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+
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+ if (reg_val & TP_UP_PENDING) {
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+ ts->ignore_fifo_data = true;
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+ input_report_key(ts->input, BTN_TOUCH, 0);
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+ input_sync(ts->input);
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+ }
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+
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+ writel(reg_val, ts->base + TP_INT_FIFOS);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static int sun4i_ts_open(struct input_dev *dev)
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+{
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+ struct sun4i_ts_data *ts = input_get_drvdata(dev);
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+
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+ /* Flush, set trig level to 1, enable data and up irqs */
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+ writel(DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | TP_UP_IRQ_EN(1),
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+ ts->base + TP_INT_FIFOC);
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+
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+ return 0;
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+}
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+
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+static void sun4i_ts_close(struct input_dev *dev)
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+{
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+ struct sun4i_ts_data *ts = input_get_drvdata(dev);
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+
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+ /* Deactivate all IRQs */
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+ writel(0, ts->base + TP_INT_FIFOC);
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+}
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+
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+static int sun4i_ts_probe(struct platform_device *pdev)
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+{
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+ struct sun4i_ts_data *ts;
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+ struct device *dev = &pdev->dev;
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+ int ret;
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+
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+ ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL);
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+ if (!ts)
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+ return -ENOMEM;
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+
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+ ts->dev = dev;
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+ ts->ignore_fifo_data = true;
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+
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+ ts->input = devm_input_allocate_device(dev);
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+ if (!ts->input)
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+ return -ENOMEM;
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+
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+ ts->input->name = pdev->name;
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+ ts->input->phys = "sun4i_ts/input0";
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+ ts->input->open = sun4i_ts_open;
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+ ts->input->close = sun4i_ts_close;
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+ ts->input->id.bustype = BUS_HOST;
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+ ts->input->id.vendor = 0x0001;
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+ ts->input->id.product = 0x0001;
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+ ts->input->id.version = 0x0100;
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+ ts->input->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
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+ set_bit(BTN_TOUCH, ts->input->keybit);
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+ input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0);
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+ input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0);
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+ input_set_drvdata(ts->input, ts);
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+
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+ ts->base = devm_ioremap_resource(dev,
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+ platform_get_resource(pdev, IORESOURCE_MEM, 0));
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+ if (IS_ERR(ts->base))
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+ return PTR_ERR(ts->base);
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+
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+ ts->irq = platform_get_irq(pdev, 0);
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+ ret = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts);
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+ if (ret)
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+ return ret;
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+
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+ /*
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+ * Select HOSC clk, clkin = clk / 6, adc samplefreq = clkin / 8192,
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+ * t_acq = clkin / (16 * 64)
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+ */
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+ writel(ADC_CLK_SEL(0) | ADC_CLK_DIV(2) | FS_DIV(7) | T_ACQ(63),
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+ ts->base + TP_CTRL0);
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+
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+ /*
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+ * sensitive_adjust = 15 : max, which is not all that sensitive,
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+ * tp_mode = 0 : only x and y coordinates, as we don't use dual touch
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+ */
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+ writel(TP_SENSITIVE_ADJUST(15) | TP_MODE_SELECT(0),
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+ ts->base + TP_CTRL2);
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+
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+ /* Enable median filter, type 1 : 5/3 */
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+ writel(FILTER_EN(1) | FILTER_TYPE(1), ts->base + TP_CTRL3);
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+
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+ /* Enable temperature measurement, period 1953 (2 seconds) */
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+ writel(TEMP_ENABLE(1) | TEMP_PERIOD(1953), ts->base + TP_TPR);
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+
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+ /*
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+ * Set stylus up debounce to aprox 10 ms, enable debounce, and
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+ * finally enable tp mode.
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+ */
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+ writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1),
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+ ts->base + TP_CTRL1);
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+
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+ ret = input_register_device(ts->input);
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+ if (ret)
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+ return ret;
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+
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+ platform_set_drvdata(pdev, ts);
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+ return 0;
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+}
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+
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+static const struct of_device_id sun4i_ts_of_match[] = {
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+ { .compatible = "allwinner,sun4i-ts", },
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+ { /* sentinel */ }
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+};
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+MODULE_DEVICE_TABLE(of, sun4i_ts_of_match);
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+
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+static struct platform_driver sun4i_ts_driver = {
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = "sun4i-ts",
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+ .of_match_table = of_match_ptr(sun4i_ts_of_match),
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+ },
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+ .probe = sun4i_ts_probe,
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+};
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+
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+module_platform_driver(sun4i_ts_driver);
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+
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+MODULE_DESCRIPTION("Allwinner sun4i resistive touchscreen controller driver");
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+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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+MODULE_LICENSE("GPL");
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--
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1.8.5.5
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