[linux-2.6-block.git] / drivers / input / touchscreen / sun4i-ts.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Allwinner sunxi resistive touchscreen controller driver
 *
 * Copyright (C) 2013 - 2014 Hans de Goede <hdegoede@redhat.com>
 *
 * The hwmon parts are based on work by Corentin LABBE which is:
 * Copyright (C) 2013 Corentin LABBE <clabbe.montjoie@gmail.com>
 */

/*
 * 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.
 *
 * s.a. A20 User Manual "1.15 TP" (Documentation/arm/sunxi/README)
 * (looks like the description in the A20 User Manual v1.3 is better
 * than the one in the A10 User Manual v.1.5)
 */

#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/thermal.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 */

/* on sun6i, bits 3~6 are left shifted by 1 to 4~7 */
#define SUN6I_TP_MODE_EN(x)	((x) << 5)

/* 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;
	int temp_data;
	int temp_offset;
	int temp_step;
};

static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val)
{
	u32 x, y;

	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);
	}
}

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);

	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 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;
}

static void sun4i_ts_close(struct input_dev *dev)
{
	struct sun4i_ts_data *ts = input_get_drvdata(dev);

	/* Deactivate all input IRQs */
	writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
}

static int sun4i_get_temp(const struct sun4i_ts_data *ts, int *temp)
{
	/* No temp_data until the first irq */
	if (ts->temp_data == -1)
		return -EAGAIN;

	*temp = ts->temp_data * ts->temp_step - ts->temp_offset;

	return 0;
}

static int sun4i_get_tz_temp(void *data, int *temp)
{
	return sun4i_get_temp(data, temp);
}

static const struct thermal_zone_of_device_ops sun4i_ts_tz_ops = {
	.get_temp = sun4i_get_tz_temp,
};

static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
			 char *buf)
{
	struct sun4i_ts_data *ts = dev_get_drvdata(dev);
	int temp;
	int error;

	error = sun4i_get_temp(ts, &temp);
	if (error)
		return error;

	return sprintf(buf, "%d\n", temp);
}

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 error;
	u32 reg;
	bool ts_attached;
	u32 tp_sensitive_adjust = 15;
	u32 filter_type = 1;

	ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL);
	if (!ts)
		return -ENOMEM;

	ts->dev = dev;
	ts->ignore_fifo_data = true;
	ts->temp_data = -1;
	if (of_device_is_compatible(np, "allwinner,sun6i-a31-ts")) {
		/* Allwinner SDK has temperature (C) = (value / 6) - 271 */
		ts->temp_offset = 271000;
		ts->temp_step = 167;
	} else if (of_device_is_compatible(np, "allwinner,sun4i-a10-ts")) {
		/*
		 * The A10 temperature sensor has quite a wide spread, these
		 * parameters are based on the averaging of the calibration
		 * results of 4 completely different boards, with a spread of
		 * temp_step from 0.096 - 0.170 and temp_offset from 176 - 331.
		 */
		ts->temp_offset = 257000;
		ts->temp_step = 133;
	} else {
		/*
		 * The user manuals do not contain the formula for calculating
		 * the temperature. The formula used here is from the AXP209,
		 * which is designed by X-Powers, an affiliate of Allwinner:
		 *
		 *     temperature (C) = (value * 0.1) - 144.7
		 *
		 * Allwinner does not have any documentation whatsoever for
		 * this hardware. Moreover, it is claimed that the sensor
		 * is inaccurate and cannot work properly.
		 */
		ts->temp_offset = 144700;
		ts->temp_step = 100;
	}

	ts_attached = of_property_read_bool(np, "allwinner,ts-attached");
	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));
	if (IS_ERR(ts->base))
		return PTR_ERR(ts->base);

	ts->irq = platform_get_irq(pdev, 0);
	error = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts);
	if (error)
		return error;

	/*
	 * 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);

	/*
	 * tp_sensitive_adjust is an optional property
	 * tp_mode = 0 : only x and y coordinates, as we don't use dual touch
	 */
	of_property_read_u32(np, "allwinner,tp-sensitive-adjust",
			     &tp_sensitive_adjust);
	writel(TP_SENSITIVE_ADJUST(tp_sensitive_adjust) | TP_MODE_SELECT(0),
	       ts->base + TP_CTRL2);

	/*
	 * Enable median and averaging filter, optional property for
	 * filter type.
	 */
	of_property_read_u32(np, "allwinner,filter-type", &filter_type);
	writel(FILTER_EN(1) | FILTER_TYPE(filter_type), 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.
	 */
	reg = STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1);
	if (of_device_is_compatible(np, "allwinner,sun6i-a31-ts"))
		reg |= SUN6I_TP_MODE_EN(1);
	else
		reg |= TP_MODE_EN(1);
	writel(reg, ts->base + TP_CTRL1);

	/*
	 * The thermal core does not register hwmon devices for DT-based
	 * thermal zone sensors, such as this one.
	 */
	hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts",
						       ts, sun4i_ts_groups);
	if (IS_ERR(hwmon))
		return PTR_ERR(hwmon);

	devm_thermal_zone_of_sensor_register(ts->dev, 0, ts, &sun4i_ts_tz_ops);

	writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);

	if (ts_attached) {
		error = input_register_device(ts->input);
		if (error) {
			writel(0, ts->base + TP_INT_FIFOC);
			return error;
		}
	}

	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-a10-ts", },
	{ .compatible = "allwinner,sun5i-a13-ts", },
	{ .compatible = "allwinner,sun6i-a31-ts", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun4i_ts_of_match);

static struct platform_driver sun4i_ts_driver = {
	.driver = {
		.name	= "sun4i-ts",
		.of_match_table = of_match_ptr(sun4i_ts_of_match),
	},
	.probe	= sun4i_ts_probe,
	.remove	= sun4i_ts_remove,
};

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");
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
6decea7c HG	2	/*
	3	* Allwinner sunxi resistive touchscreen controller driver
	4	*
	5	* Copyright (C) 2013 - 2014 Hans de Goede <hdegoede@redhat.com>
	6	*
f09f98d3 HG	7	* The hwmon parts are based on work by Corentin LABBE which is:
f09f98d3 HG	8	* Copyright (C) 2013 Corentin LABBE <clabbe.montjoie@gmail.com>
6decea7c HG	9	*/
	10
	11	/*
	12	* The sun4i-ts controller is capable of detecting a second touch, but when a
	13	* second touch is present then the accuracy becomes so bad the reported touch
	14	* location is not useable.
	15	*
	16	* The original android driver contains some complicated heuristics using the
	17	* aprox. distance between the 2 touches to see if the user is making a pinch
	18	* open / close movement, and then reports emulated multi-touch events around
	19	* the last touch coordinate (as the dual-touch coordinates are worthless).
	20	*
	21	* These kinds of heuristics are just asking for trouble (and don't belong
	22	* in the kernel). So this driver offers straight forward, reliable single
	23	* touch functionality only.
4ed0e032 JT	24	*
	25	* s.a. A20 User Manual "1.15 TP" (Documentation/arm/sunxi/README)
	26	* (looks like the description in the A20 User Manual v1.3 is better
	27	* than the one in the A10 User Manual v.1.5)
6decea7c HG	28	*/
	29
	30	#include <linux/err.h>
f09f98d3	31	#include <linux/hwmon.h>
22369710	32	#include <linux/thermal.h>
6decea7c HG	33	#include <linux/init.h>
	34	#include <linux/input.h>
	35	#include <linux/interrupt.h>
	36	#include <linux/io.h>
	37	#include <linux/module.h>
	38	#include <linux/of_platform.h>
	39	#include <linux/platform_device.h>
	40	#include <linux/slab.h>
	41
	42	#define TP_CTRL0 0x00
	43	#define TP_CTRL1 0x04
	44	#define TP_CTRL2 0x08
	45	#define TP_CTRL3 0x0c
	46	#define TP_INT_FIFOC 0x10
	47	#define TP_INT_FIFOS 0x14
	48	#define TP_TPR 0x18
	49	#define TP_CDAT 0x1c
	50	#define TEMP_DATA 0x20
	51	#define TP_DATA 0x24
	52
	53	/* TP_CTRL0 bits */
	54	#define ADC_FIRST_DLY(x) ((x) << 24) /* 8 bits */
	55	#define ADC_FIRST_DLY_MODE(x) ((x) << 23)
	56	#define ADC_CLK_SEL(x) ((x) << 22)
	57	#define ADC_CLK_DIV(x) ((x) << 20) /* 3 bits */
	58	#define FS_DIV(x) ((x) << 16) /* 4 bits */
	59	#define T_ACQ(x) ((x) << 0) /* 16 bits */
	60
	61	/* TP_CTRL1 bits */
	62	#define STYLUS_UP_DEBOUN(x) ((x) << 12) /* 8 bits */
	63	#define STYLUS_UP_DEBOUN_EN(x) ((x) << 9)
	64	#define TOUCH_PAN_CALI_EN(x) ((x) << 6)
	65	#define TP_DUAL_EN(x) ((x) << 5)
	66	#define TP_MODE_EN(x) ((x) << 4)
	67	#define TP_ADC_SELECT(x) ((x) << 3)
	68	#define ADC_CHAN_SELECT(x) ((x) << 0) /* 3 bits */
	69
43c0e223 CYT	70	/* on sun6i, bits 3~6 are left shifted by 1 to 4~7 */
	71	#define SUN6I_TP_MODE_EN(x) ((x) << 5)
	72
6decea7c HG	73	/* TP_CTRL2 bits */
	74	#define TP_SENSITIVE_ADJUST(x) ((x) << 28) /* 4 bits */
	75	#define TP_MODE_SELECT(x) ((x) << 26) /* 2 bits */
	76	#define PRE_MEA_EN(x) ((x) << 24)
	77	#define PRE_MEA_THRE_CNT(x) ((x) << 0) /* 24 bits */
	78
	79	/* TP_CTRL3 bits */
	80	#define FILTER_EN(x) ((x) << 2)
	81	#define FILTER_TYPE(x) ((x) << 0) /* 2 bits */
	82
	83	/* TP_INT_FIFOC irq and fifo mask / control bits */
	84	#define TEMP_IRQ_EN(x) ((x) << 18)
	85	#define OVERRUN_IRQ_EN(x) ((x) << 17)
	86	#define DATA_IRQ_EN(x) ((x) << 16)
	87	#define TP_DATA_XY_CHANGE(x) ((x) << 13)
	88	#define FIFO_TRIG(x) ((x) << 8) /* 5 bits */
	89	#define DATA_DRQ_EN(x) ((x) << 7)
	90	#define FIFO_FLUSH(x) ((x) << 4)
	91	#define TP_UP_IRQ_EN(x) ((x) << 1)
	92	#define TP_DOWN_IRQ_EN(x) ((x) << 0)
	93
	94	/* TP_INT_FIFOS irq and fifo status bits */
	95	#define TEMP_DATA_PENDING BIT(18)
	96	#define FIFO_OVERRUN_PENDING BIT(17)
	97	#define FIFO_DATA_PENDING BIT(16)
	98	#define TP_IDLE_FLG BIT(2)
	99	#define TP_UP_PENDING BIT(1)
	100	#define TP_DOWN_PENDING BIT(0)
	101
	102	/* TP_TPR bits */
	103	#define TEMP_ENABLE(x) ((x) << 16)
	104	#define TEMP_PERIOD(x) ((x) << 0) /* t = x * 256 * 16 / clkin */
	105
	106	struct sun4i_ts_data {
	107	struct device *dev;
	108	struct input_dev *input;
	109	void __iomem *base;
	110	unsigned int irq;
	111	bool ignore_fifo_data;
f09f98d3	112	int temp_data;
43c0e223 CYT	113	int temp_offset;
43c0e223 CYT	114	int temp_step;
6decea7c HG	115	};
6decea7c HG	116
f09f98d3	117	static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val)
6decea7c	118	{
f09f98d3	119	u32 x, y;
6decea7c HG	120
	121	if (reg_val & FIFO_DATA_PENDING) {
	122	x = readl(ts->base + TP_DATA);
	123	y = readl(ts->base + TP_DATA);
	124	/* The 1st location reported after an up event is unreliable */
	125	if (!ts->ignore_fifo_data) {
	126	input_report_abs(ts->input, ABS_X, x);
	127	input_report_abs(ts->input, ABS_Y, y);
	128	/*
	129	* The hardware has a separate down status bit, but
	130	* that gets set before we get the first location,
	131	* resulting in reporting a click on the old location.
	132	*/
	133	input_report_key(ts->input, BTN_TOUCH, 1);
	134	input_sync(ts->input);
	135	} else {
	136	ts->ignore_fifo_data = false;
	137	}
	138	}
	139
	140	if (reg_val & TP_UP_PENDING) {
	141	ts->ignore_fifo_data = true;
	142	input_report_key(ts->input, BTN_TOUCH, 0);
	143	input_sync(ts->input);
	144	}
f09f98d3 HG	145	}
	146
	147	static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
	148	{
	149	struct sun4i_ts_data *ts = dev_id;
	150	u32 reg_val;
	151
	152	reg_val = readl(ts->base + TP_INT_FIFOS);
	153
	154	if (reg_val & TEMP_DATA_PENDING)
	155	ts->temp_data = readl(ts->base + TEMP_DATA);
	156
	157	if (ts->input)
	158	sun4i_ts_irq_handle_input(ts, reg_val);
6decea7c HG	159
	160	writel(reg_val, ts->base + TP_INT_FIFOS);
	161
	162	return IRQ_HANDLED;
	163	}
	164
	165	static int sun4i_ts_open(struct input_dev *dev)
	166	{
	167	struct sun4i_ts_data *ts = input_get_drvdata(dev);
	168
f09f98d3 HG	169	/* Flush, set trig level to 1, enable temp, data and up irqs */
	170	writel(TEMP_IRQ_EN(1) \| DATA_IRQ_EN(1) \| FIFO_TRIG(1) \| FIFO_FLUSH(1) \|
	171	TP_UP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
6decea7c HG	172
	173	return 0;
	174	}
	175
	176	static void sun4i_ts_close(struct input_dev *dev)
	177	{
	178	struct sun4i_ts_data *ts = input_get_drvdata(dev);
	179
f09f98d3 HG	180	/* Deactivate all input IRQs */
	181	writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
	182	}
	183
17e8351a	184	static int sun4i_get_temp(const struct sun4i_ts_data ts, int temp)
22369710 CYT	185	{
	186	/* No temp_data until the first irq */
	187	if (ts->temp_data == -1)
	188	return -EAGAIN;
	189
877bef7d	190	temp = ts->temp_data ts->temp_step - ts->temp_offset;
22369710 CYT	191
	192	return 0;
	193	}
	194
17e8351a	195	static int sun4i_get_tz_temp(void data, int temp)
22369710 CYT	196	{
	197	return sun4i_get_temp(data, temp);
	198	}
	199
d54cf213	200	static const struct thermal_zone_of_device_ops sun4i_ts_tz_ops = {
22369710 CYT	201	.get_temp = sun4i_get_tz_temp,
	202	};
	203
f09f98d3 HG	204	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	205	char *buf)
	206	{
	207	struct sun4i_ts_data *ts = dev_get_drvdata(dev);
17e8351a	208	int temp;
22369710	209	int error;
f09f98d3	210
22369710 CYT	211	error = sun4i_get_temp(ts, &temp);
	212	if (error)
	213	return error;
f09f98d3	214
17e8351a	215	return sprintf(buf, "%d\n", temp);
f09f98d3 HG	216	}
	217
	218	static ssize_t show_temp_label(struct device *dev,
	219	struct device_attribute devattr, char buf)
	220	{
	221	return sprintf(buf, "SoC temperature\n");
6decea7c HG	222	}
6decea7c HG	223
f09f98d3 HG	224	static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
	225	static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL);
	226
	227	static struct attribute *sun4i_ts_attrs[] = {
	228	&dev_attr_temp1_input.attr,
	229	&dev_attr_temp1_label.attr,
	230	NULL
	231	};
	232	ATTRIBUTE_GROUPS(sun4i_ts);
	233
6decea7c HG	234	static int sun4i_ts_probe(struct platform_device *pdev)
	235	{
	236	struct sun4i_ts_data *ts;
	237	struct device *dev = &pdev->dev;
f09f98d3 HG	238	struct device_node *np = dev->of_node;
f09f98d3 HG	239	struct device *hwmon;
6decea7c	240	int error;
43c0e223	241	u32 reg;
f09f98d3	242	bool ts_attached;
4ed0e032 JT	243	u32 tp_sensitive_adjust = 15;
4ed0e032 JT	244	u32 filter_type = 1;
6decea7c HG	245
	246	ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL);
	247	if (!ts)
	248	return -ENOMEM;
	249
	250	ts->dev = dev;
	251	ts->ignore_fifo_data = true;
f09f98d3	252	ts->temp_data = -1;
43c0e223	253	if (of_device_is_compatible(np, "allwinner,sun6i-a31-ts")) {
877bef7d HG	254	/* Allwinner SDK has temperature (C) = (value / 6) - 271 */
877bef7d HG	255	ts->temp_offset = 271000;
43c0e223	256	ts->temp_step = 167;
91c68a7c HG	257	} else if (of_device_is_compatible(np, "allwinner,sun4i-a10-ts")) {
	258	/*
	259	* The A10 temperature sensor has quite a wide spread, these
	260	* parameters are based on the averaging of the calibration
	261	* results of 4 completely different boards, with a spread of
877bef7d	262	* temp_step from 0.096 - 0.170 and temp_offset from 176 - 331.
91c68a7c	263	*/
877bef7d	264	ts->temp_offset = 257000;
91c68a7c	265	ts->temp_step = 133;
43c0e223 CYT	266	} else {
	267	/*
	268	* The user manuals do not contain the formula for calculating
	269	* the temperature. The formula used here is from the AXP209,
	270	* which is designed by X-Powers, an affiliate of Allwinner:
	271	*
877bef7d	272	* temperature (C) = (value * 0.1) - 144.7
43c0e223 CYT	273	*
	274	* Allwinner does not have any documentation whatsoever for
	275	* this hardware. Moreover, it is claimed that the sensor
	276	* is inaccurate and cannot work properly.
	277	*/
877bef7d	278	ts->temp_offset = 144700;
43c0e223 CYT	279	ts->temp_step = 100;
43c0e223 CYT	280	}
f09f98d3 HG	281
	282	ts_attached = of_property_read_bool(np, "allwinner,ts-attached");
	283	if (ts_attached) {
	284	ts->input = devm_input_allocate_device(dev);
	285	if (!ts->input)
	286	return -ENOMEM;
	287
	288	ts->input->name = pdev->name;
	289	ts->input->phys = "sun4i_ts/input0";
	290	ts->input->open = sun4i_ts_open;
	291	ts->input->close = sun4i_ts_close;
	292	ts->input->id.bustype = BUS_HOST;
	293	ts->input->id.vendor = 0x0001;
	294	ts->input->id.product = 0x0001;
	295	ts->input->id.version = 0x0100;
	296	ts->input->evbit[0] = BIT(EV_SYN) \| BIT(EV_KEY) \| BIT(EV_ABS);
	297	__set_bit(BTN_TOUCH, ts->input->keybit);
	298	input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0);
	299	input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0);
	300	input_set_drvdata(ts->input, ts);
	301	}
6decea7c HG	302
	303	ts->base = devm_ioremap_resource(dev,
	304	platform_get_resource(pdev, IORESOURCE_MEM, 0));
	305	if (IS_ERR(ts->base))
	306	return PTR_ERR(ts->base);
	307
	308	ts->irq = platform_get_irq(pdev, 0);
	309	error = devm_request_irq(dev, ts->irq, sun4i_ts_irq, 0, "sun4i-ts", ts);
	310	if (error)
	311	return error;
	312
	313	/*
	314	* Select HOSC clk, clkin = clk / 6, adc samplefreq = clkin / 8192,
	315	* t_acq = clkin / (16 * 64)
	316	*/
	317	writel(ADC_CLK_SEL(0) \| ADC_CLK_DIV(2) \| FS_DIV(7) \| T_ACQ(63),
	318	ts->base + TP_CTRL0);
	319
	320	/*
4ed0e032	321	* tp_sensitive_adjust is an optional property
6decea7c HG	322	* tp_mode = 0 : only x and y coordinates, as we don't use dual touch
6decea7c HG	323	*/
4ed0e032 JT	324	of_property_read_u32(np, "allwinner,tp-sensitive-adjust",
	325	&tp_sensitive_adjust);
	326	writel(TP_SENSITIVE_ADJUST(tp_sensitive_adjust) \| TP_MODE_SELECT(0),
6decea7c HG	327	ts->base + TP_CTRL2);
6decea7c HG	328
4ed0e032 JT	329	/*
	330	* Enable median and averaging filter, optional property for
	331	* filter type.
	332	*/
	333	of_property_read_u32(np, "allwinner,filter-type", &filter_type);
	334	writel(FILTER_EN(1) \| FILTER_TYPE(filter_type), ts->base + TP_CTRL3);
6decea7c HG	335
	336	/* Enable temperature measurement, period 1953 (2 seconds) */
	337	writel(TEMP_ENABLE(1) \| TEMP_PERIOD(1953), ts->base + TP_TPR);
	338
	339	/*
	340	* Set stylus up debounce to aprox 10 ms, enable debounce, and
	341	* finally enable tp mode.
	342	*/
43c0e223	343	reg = STYLUS_UP_DEBOUN(5) \| STYLUS_UP_DEBOUN_EN(1);
91c68a7c	344	if (of_device_is_compatible(np, "allwinner,sun6i-a31-ts"))
43c0e223	345	reg \|= SUN6I_TP_MODE_EN(1);
91c68a7c HG	346	else
91c68a7c HG	347	reg \|= TP_MODE_EN(1);
43c0e223	348	writel(reg, ts->base + TP_CTRL1);
6decea7c	349
22369710 CYT	350	/*
	351	* The thermal core does not register hwmon devices for DT-based
	352	* thermal zone sensors, such as this one.
	353	*/
f09f98d3 HG	354	hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts",
	355	ts, sun4i_ts_groups);
	356	if (IS_ERR(hwmon))
	357	return PTR_ERR(hwmon);
	358
e28d0c9c	359	devm_thermal_zone_of_sensor_register(ts->dev, 0, ts, &sun4i_ts_tz_ops);
22369710	360
f09f98d3 HG	361	writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
	362
	363	if (ts_attached) {
	364	error = input_register_device(ts->input);
	365	if (error) {
	366	writel(0, ts->base + TP_INT_FIFOC);
	367	return error;
	368	}
	369	}
6decea7c HG	370
	371	platform_set_drvdata(pdev, ts);
	372	return 0;
	373	}
	374
f09f98d3 HG	375	static int sun4i_ts_remove(struct platform_device *pdev)
	376	{
	377	struct sun4i_ts_data *ts = platform_get_drvdata(pdev);
	378
	379	/* Explicit unregister to avoid open/close changing the imask later */
	380	if (ts->input)
	381	input_unregister_device(ts->input);
	382
	383	/* Deactivate all IRQs */
	384	writel(0, ts->base + TP_INT_FIFOC);
	385
	386	return 0;
	387	}
	388
6decea7c HG	389	static const struct of_device_id sun4i_ts_of_match[] = {
6decea7c HG	390	{ .compatible = "allwinner,sun4i-a10-ts", },
91c68a7c	391	{ .compatible = "allwinner,sun5i-a13-ts", },
43c0e223	392	{ .compatible = "allwinner,sun6i-a31-ts", },
6decea7c HG	393	{ /* sentinel */ }
	394	};
	395	MODULE_DEVICE_TABLE(of, sun4i_ts_of_match);
	396
	397	static struct platform_driver sun4i_ts_driver = {
	398	.driver = {
6decea7c HG	399	.name = "sun4i-ts",
	400	.of_match_table = of_match_ptr(sun4i_ts_of_match),
	401	},
	402	.probe = sun4i_ts_probe,
f09f98d3	403	.remove = sun4i_ts_remove,
6decea7c HG	404	};
	405
	406	module_platform_driver(sun4i_ts_driver);
	407
	408	MODULE_DESCRIPTION("Allwinner sun4i resistive touchscreen controller driver");
	409	MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
	410	MODULE_LICENSE("GPL");