diff options
Diffstat (limited to 'target/linux/sunxi/patches-3.13/280-input-add-sun4i-ts-driver.patch')
| -rw-r--r-- | target/linux/sunxi/patches-3.13/280-input-add-sun4i-ts-driver.patch | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.13/280-input-add-sun4i-ts-driver.patch b/target/linux/sunxi/patches-3.13/280-input-add-sun4i-ts-driver.patch new file mode 100644 index 0000000000..e42f0feeb7 --- /dev/null +++ b/target/linux/sunxi/patches-3.13/280-input-add-sun4i-ts-driver.patch @@ -0,0 +1,354 @@ +From 328d21d9c56ddca56ed80b1595066b1621f6926b 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"); +-- +1.8.5.5 + |