add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/input/touchscreen/ad7879.c
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@@ -1,9 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * AD7879/AD7889 based touchscreen and GPIO driver
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  *
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  * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
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- *
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- * Licensed under the GPL-2 or later.
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  *
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  * History:
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  * Copyright (c) 2005 David Brownell
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@@ -29,10 +28,9 @@
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 #include <linux/property.h>
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 #include <linux/regmap.h>
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 #include <linux/slab.h>
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-#include <linux/gpio.h>
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+#include <linux/gpio/driver.h>
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 #include <linux/input/touchscreen.h>
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-#include <linux/platform_data/ad7879.h>
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 #include <linux/module.h>
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 #include "ad7879.h"
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@@ -247,11 +245,14 @@
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 static irqreturn_t ad7879_irq(int irq, void *handle)
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 {
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 	struct ad7879 *ts = handle;
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+	int error;
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-	regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
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-			 ts->conversion_data, AD7879_NR_SENSE);
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-
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-	if (!ad7879_report(ts))
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+	error = regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
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+				 ts->conversion_data, AD7879_NR_SENSE);
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+	if (error)
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+		dev_err_ratelimited(ts->dev, "failed to read %#02x: %d\n",
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+				    AD7879_REG_XPLUS, error);
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+	else if (!ad7879_report(ts))
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 		mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
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 	return IRQ_HANDLED;
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@@ -290,7 +291,7 @@
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 	return 0;
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 }
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-static void ad7879_close(struct input_dev* input)
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+static void ad7879_close(struct input_dev *input)
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 {
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 	struct ad7879 *ts = input_get_drvdata(input);
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@@ -452,47 +453,36 @@
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 	mutex_unlock(&ts->mutex);
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 }
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-static int ad7879_gpio_add(struct ad7879 *ts,
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-			   const struct ad7879_platform_data *pdata)
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+static int ad7879_gpio_add(struct ad7879 *ts)
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 {
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-	bool gpio_export;
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-	int gpio_base;
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 	int ret = 0;
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-
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-	if (pdata) {
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-		gpio_export = pdata->gpio_export;
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-		gpio_base = pdata->gpio_base;
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-	} else {
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-		gpio_export = device_property_read_bool(ts->dev,
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-							"gpio-controller");
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-		gpio_base = -1;
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-	}
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 	mutex_init(&ts->mutex);
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-	if (gpio_export) {
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-		ts->gc.direction_input = ad7879_gpio_direction_input;
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-		ts->gc.direction_output = ad7879_gpio_direction_output;
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-		ts->gc.get = ad7879_gpio_get_value;
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-		ts->gc.set = ad7879_gpio_set_value;
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-		ts->gc.can_sleep = 1;
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-		ts->gc.base = gpio_base;
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-		ts->gc.ngpio = 1;
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-		ts->gc.label = "AD7879-GPIO";
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-		ts->gc.owner = THIS_MODULE;
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-		ts->gc.parent = ts->dev;
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+	/* Do not create a chip unless flagged for it */
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+	if (!device_property_read_bool(ts->dev, "gpio-controller"))
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+		return 0;
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-		ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
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-		if (ret)
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-			dev_err(ts->dev, "failed to register gpio %d\n",
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-				ts->gc.base);
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-	}
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+	ts->gc.direction_input = ad7879_gpio_direction_input;
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+	ts->gc.direction_output = ad7879_gpio_direction_output;
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+	ts->gc.get = ad7879_gpio_get_value;
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+	ts->gc.set = ad7879_gpio_set_value;
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+	ts->gc.can_sleep = 1;
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+	ts->gc.base = -1;
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+	ts->gc.ngpio = 1;
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+	ts->gc.label = "AD7879-GPIO";
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+	ts->gc.owner = THIS_MODULE;
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+	ts->gc.parent = ts->dev;
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+
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+	ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
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+	if (ret)
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+		dev_err(ts->dev, "failed to register gpio %d\n",
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+			ts->gc.base);
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 	return ret;
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 }
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 #else
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-static int ad7879_gpio_add(struct ad7879 *ts,
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-			   const struct ad7879_platform_data *pdata)
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+static int ad7879_gpio_add(struct ad7879 *ts)
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 {
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 	return 0;
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 }
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@@ -527,7 +517,6 @@
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 int ad7879_probe(struct device *dev, struct regmap *regmap,
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 		 int irq, u16 bustype, u8 devid)
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 {
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-	struct ad7879_platform_data *pdata = dev_get_platdata(dev);
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 	struct ad7879 *ts;
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 	struct input_dev *input_dev;
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 	int err;
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@@ -542,22 +531,9 @@
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 	if (!ts)
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 		return -ENOMEM;
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-	if (pdata) {
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-		/* Platform data use swapped axis (backward compatibility) */
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-		ts->swap_xy = !pdata->swap_xy;
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-
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-		ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
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-
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-		ts->first_conversion_delay = pdata->first_conversion_delay;
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-		ts->acquisition_time = pdata->acquisition_time;
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-		ts->averaging = pdata->averaging;
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-		ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
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-		ts->median = pdata->median;
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-	} else {
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-		err = ad7879_parse_dt(dev, ts);
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-		if (err)
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-			return err;
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-	}
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+	err = ad7879_parse_dt(dev, ts);
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+	if (err)
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+		return err;
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 	input_dev = devm_input_allocate_device(dev);
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 	if (!input_dev) {
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@@ -585,28 +561,13 @@
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 	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
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-	if (pdata) {
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-		input_set_abs_params(input_dev, ABS_X,
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-				pdata->x_min ? : 0,
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-				pdata->x_max ? : MAX_12BIT,
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-				0, 0);
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-		input_set_abs_params(input_dev, ABS_Y,
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-				pdata->y_min ? : 0,
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-				pdata->y_max ? : MAX_12BIT,
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-				0, 0);
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-		input_set_abs_params(input_dev, ABS_PRESSURE,
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-				pdata->pressure_min,
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-				pdata->pressure_max ? : ~0,
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-				0, 0);
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-	} else {
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-		input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
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-		input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
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-		input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
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-		touchscreen_parse_properties(input_dev, false, NULL);
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-		if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
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-			dev_err(dev, "Touchscreen pressure is not specified\n");
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-			return -EINVAL;
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-		}
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+	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
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+	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
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+	input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
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+	touchscreen_parse_properties(input_dev, false, NULL);
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+	if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
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+		dev_err(dev, "Touchscreen pressure is not specified\n");
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+		return -EINVAL;
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 	}
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 	err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
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@@ -655,7 +616,7 @@
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 	if (err)
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 		return err;
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-	err = ad7879_gpio_add(ts, pdata);
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+	err = ad7879_gpio_add(ts);
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 	if (err)
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 		return err;
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