[PATCH resend 0/2] input: Add new sun4i-ts driver for Allwinner sunxi SoCs

[PATCH resend 0/2] input: Add new sun4i-ts driver for Allwinner sunxi SoCs

[Hans de Goede]

Hi Dmitry,

I already send this patch a while ago, and it got only positive feedback,
despite this it has not been applied, hence this resend.

Note the second patch which adds hwmon functionality has been reviewed by
the hwon subsystem maintainer, and the sun?i*.dts changes to enable this
have already been upstreamed.

Thanks & Regards,

Hans

[PATCH v3 1/2] input: Add new sun4i-ts driver for Allwinner sunxi SoC's rtp controller

[Hans de Goede]

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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 .../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 68edc9d..b8366cb 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -897,6 +897,16 @@ 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 4bc954b..71a9755 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_TOUCHIT213)	+= touchit213.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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
+ *
+ * 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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>");
+MODULE_LICENSE("GPL");
-- 
1.9.0

[PATCH v3 2/2] input: sun4i-ts: Add support for temperature sensor

[Hans de Goede]

The sun4i resisitive touchscreen controller also comes with a built-in
temperature sensor. This commit adds support for it.

This commit also introduces a new "ts-attached" device-tree property,
when this is not set, the input part of the driver won't register. This way
the internal temperature sensor can be used to measure the SoC temperature
independent of there actually being a touchscreen attached to the controller.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
---
 .../bindings/input/touchscreen/sun4i.txt           |   5 +
 drivers/input/touchscreen/sun4i-ts.c               | 140 ++++++++++++++++-----
 2 files changed, 114 insertions(+), 31 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
index e45927e..6bac67b 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
@@ -6,10 +6,15 @@ Required properties:
  - reg: mmio address range of the chip
  - interrupts: interrupt to which the chip is connected
 
+Optional properties:
+ - allwinner,ts-attached: boolean indicating that an actual touchscreen is
+			  attached to the controller
+
 Example:
 
 	rtp: rtp@01c25000 {
 		compatible = "allwinner,sun4i-ts";
 		reg = <0x01c25000 0x100>;
 		interrupts = <29>;
+		allwinner,ts-attached;
 	};
diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
index 5945219..16cbb01 100644
--- a/drivers/input/touchscreen/sun4i-ts.c
+++ b/drivers/input/touchscreen/sun4i-ts.c
@@ -3,6 +3,9 @@
  *
  * Copyright (C) 2013 - 2014 Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
  *
+ * The hwmon parts are based on work by Corentin LABBE which is:
+ * Copyright (C) 2013 Corentin LABBE <clabbe.montjoie-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
  * 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
@@ -30,6 +33,7 @@
  */
 
 #include <linux/err.h>
+#include <linux/hwmon.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
@@ -106,14 +110,12 @@ struct sun4i_ts_data {
 	void __iomem *base;
 	unsigned int irq;
 	bool ignore_fifo_data;
+	int temp_data;
 };
 
-static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
+static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val)
 {
-	struct sun4i_ts_data *ts = dev_id;
-	u32 reg_val, x, y;
-
-	reg_val  = readl(ts->base + TP_INT_FIFOS);
+	u32 x, y;
 
 	if (reg_val & FIFO_DATA_PENDING) {
 		x = readl(ts->base + TP_DATA);
@@ -139,6 +141,20 @@ static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
 		input_report_key(ts->input, BTN_TOUCH, 0);
 		input_sync(ts->input);
 	}
+}
+
+static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
+{
+	struct sun4i_ts_data *ts = dev_id;
+	u32 reg_val;
+
+	reg_val  = readl(ts->base + TP_INT_FIFOS);
+
+	if (reg_val & TEMP_DATA_PENDING)
+		ts->temp_data = readl(ts->base + TEMP_DATA);
+
+	if (ts->input)
+		sun4i_ts_irq_handle_input(ts, reg_val);
 
 	writel(reg_val, ts->base + TP_INT_FIFOS);
 
@@ -149,9 +165,9 @@ 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);
+	/* Flush, set trig level to 1, enable temp, data and up irqs */
+	writel(TEMP_IRQ_EN(1) | DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) |
+		TP_UP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
 
 	return 0;
 }
@@ -160,15 +176,48 @@ 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);
+	/* Deactivate all input IRQs */
+	writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
+}
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
+			 char *buf)
+{
+	struct sun4i_ts_data *ts = dev_get_drvdata(dev);
+
+	/* No temp_data until the first irq */
+	if (ts->temp_data == -1)
+		return -EAGAIN;
+
+	return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100);
+}
+
+static ssize_t show_temp_label(struct device *dev,
+			      struct device_attribute *devattr, char *buf)
+{
+	return sprintf(buf, "SoC temperature\n");
 }
 
+static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
+static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL);
+
+static struct attribute *sun4i_ts_attrs[] = {
+	&dev_attr_temp1_input.attr,
+	&dev_attr_temp1_label.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(sun4i_ts);
+
 static int sun4i_ts_probe(struct platform_device *pdev)
 {
 	struct sun4i_ts_data *ts;
 	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct device *hwmon;
 	int ret;
+	bool ts_attached;
+
+	ts_attached = of_property_read_bool(np, "allwinner,ts-attached");
 
 	ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL);
 	if (!ts)
@@ -176,24 +225,27 @@ static int sun4i_ts_probe(struct platform_device *pdev)
 
 	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->temp_data = -1;
+
+	if (ts_attached) {
+		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));
@@ -232,14 +284,39 @@ static int sun4i_ts_probe(struct platform_device *pdev)
 	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;
+	hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts",
+						       ts, sun4i_ts_groups);
+	if (IS_ERR(hwmon))
+		return PTR_ERR(hwmon);
+
+	writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
+
+	if (ts_attached) {
+		ret = input_register_device(ts->input);
+		if (ret) {
+			writel(0, ts->base + TP_INT_FIFOC);
+			return ret;
+		}
+	}
 
 	platform_set_drvdata(pdev, ts);
 	return 0;
 }
 
+static int sun4i_ts_remove(struct platform_device *pdev)
+{
+	struct sun4i_ts_data *ts = platform_get_drvdata(pdev);
+
+	/* Explicit unregister to avoid open/close changing the imask later */
+	if (ts->input)
+		input_unregister_device(ts->input);
+
+	/* Deactivate all IRQs */
+	writel(0, ts->base + TP_INT_FIFOC);
+
+	return 0;
+}
+
 static const struct of_device_id sun4i_ts_of_match[] = {
 	{ .compatible = "allwinner,sun4i-ts", },
 	{ /* sentinel */ }
@@ -253,6 +330,7 @@ static struct platform_driver sun4i_ts_driver = {
 		.of_match_table = of_match_ptr(sun4i_ts_of_match),
 	},
 	.probe	= sun4i_ts_probe,
+	.remove	= sun4i_ts_remove,
 };
 
 module_platform_driver(sun4i_ts_driver);
-- 
1.9.0

Re: [PATCH v3 1/2] input: Add new sun4i-ts driver for Allwinner sunxi SoC's rtp controller

[Maxime Ripard]

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Hi Hans,

Thanks a lot for reposting this.

On Sat, May 10, 2014 at 12:47:05PM +0200, Hans de Goede wrote:
> 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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  .../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"

In between, I changed the compatible of this driver to sun4i-a10-ts to
match the pattern used everywhere else. You should probably update it
in your driver as well :)

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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