[PATCH 11/16] Input: remove w90x900 touchscreen driver

From: Arnd Bergmann <arnd@arndb.de>
To: soc@kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	linux-kernel@vger.kernel.org, linux-input@vger.kernel.org
Subject: [PATCH 11/16] Input: remove w90x900 touchscreen driver
Date: Fri,  9 Aug 2019 22:27:39 +0200	[thread overview]
Message-ID: <20190809202749.742267-12-arnd@arndb.de> (raw)
In-Reply-To: <20190809202749.742267-1-arnd@arndb.de>

The ARM w90x900 platform is getting removed, so this driver is obsolete.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/input/touchscreen/Kconfig      |   9 -
 drivers/input/touchscreen/Makefile     |   1 -
 drivers/input/touchscreen/w90p910_ts.c | 331 -------------------------
 3 files changed, 341 deletions(-)
 delete mode 100644 drivers/input/touchscreen/w90p910_ts.c

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index fb91f2d4049e..46ad9090493b 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1112,15 +1112,6 @@ config TOUCHSCREEN_TSC2007_IIO
 	  or ambient light monitoring), temperature and raw input
 	  values.
 
-config TOUCHSCREEN_W90X900
-	tristate "W90P910 touchscreen driver"
-	depends on ARCH_W90X900
-	help
-	  Say Y here if you have a W90P910 based touchscreen.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called w90p910_ts.
-
 config TOUCHSCREEN_PCAP
 	tristate "Motorola PCAP touchscreen"
 	depends on EZX_PCAP
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 084a596a0c8b..94c6162409b3 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -102,7 +102,6 @@ wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712)	+= wm9712.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713)	+= wm9713.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE)	+= mainstone-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE)	+= zylonite-wm97xx.o
-obj-$(CONFIG_TOUCHSCREEN_W90X900)	+= w90p910_ts.o
 obj-$(CONFIG_TOUCHSCREEN_SX8654)	+= sx8654.o
 obj-$(CONFIG_TOUCHSCREEN_TPS6507X)	+= tps6507x-ts.o
 obj-$(CONFIG_TOUCHSCREEN_ZET6223)	+= zet6223.o
diff --git a/drivers/input/touchscreen/w90p910_ts.c b/drivers/input/touchscreen/w90p910_ts.c
deleted file mode 100644
index 7893d7fa398c..000000000000
--- a/drivers/input/touchscreen/w90p910_ts.c
+++ /dev/null
@@ -1,331 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2008 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#include <linux/delay.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-
-/* ADC controller bit defines */
-#define ADC_DELAY	0xf00
-#define ADC_DOWN	0x01
-#define ADC_TSC_Y	(0x01 << 8)
-#define ADC_TSC_X	(0x00 << 8)
-#define TSC_FOURWIRE	(~(0x03 << 1))
-#define ADC_CLK_EN	(0x01 << 28)	/* ADC clock enable */
-#define ADC_READ_CON	(0x01 << 12)
-#define ADC_CONV	(0x01 << 13)
-#define ADC_SEMIAUTO	(0x01 << 14)
-#define ADC_WAITTRIG	(0x03 << 14)
-#define ADC_RST1	(0x01 << 16)
-#define ADC_RST0	(0x00 << 16)
-#define ADC_EN		(0x01 << 17)
-#define ADC_INT		(0x01 << 18)
-#define WT_INT		(0x01 << 20)
-#define ADC_INT_EN	(0x01 << 21)
-#define LVD_INT_EN	(0x01 << 22)
-#define WT_INT_EN	(0x01 << 23)
-#define ADC_DIV		(0x04 << 1)	/* div = 6 */
-
-enum ts_state {
-	TS_WAIT_NEW_PACKET,	/* We are waiting next touch report */
-	TS_WAIT_X_COORD,	/* We are waiting for ADC to report X coord */
-	TS_WAIT_Y_COORD,	/* We are waiting for ADC to report Y coord */
-	TS_IDLE,		/* Input device is closed, don't do anything */
-};
-
-struct w90p910_ts {
-	struct input_dev *input;
-	struct timer_list timer;
-	struct clk *clk;
-	int irq_num;
-	void __iomem *ts_reg;
-	spinlock_t lock;
-	enum ts_state state;
-};
-
-static void w90p910_report_event(struct w90p910_ts *w90p910_ts, bool down)
-{
-	struct input_dev *dev = w90p910_ts->input;
-
-	if (down) {
-		input_report_abs(dev, ABS_X,
-				 __raw_readl(w90p910_ts->ts_reg + 0x0c));
-		input_report_abs(dev, ABS_Y,
-				 __raw_readl(w90p910_ts->ts_reg + 0x10));
-	}
-
-	input_report_key(dev, BTN_TOUCH, down);
-	input_sync(dev);
-}
-
-static void w90p910_prepare_x_reading(struct w90p910_ts *w90p910_ts)
-{
-	unsigned long ctlreg;
-
-	__raw_writel(ADC_TSC_X, w90p910_ts->ts_reg + 0x04);
-	ctlreg = __raw_readl(w90p910_ts->ts_reg);
-	ctlreg &= ~(ADC_WAITTRIG | WT_INT | WT_INT_EN);
-	ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
-	__raw_writel(ctlreg, w90p910_ts->ts_reg);
-
-	w90p910_ts->state = TS_WAIT_X_COORD;
-}
-
-static void w90p910_prepare_y_reading(struct w90p910_ts *w90p910_ts)
-{
-	unsigned long ctlreg;
-
-	__raw_writel(ADC_TSC_Y, w90p910_ts->ts_reg + 0x04);
-	ctlreg = __raw_readl(w90p910_ts->ts_reg);
-	ctlreg &= ~(ADC_WAITTRIG | ADC_INT | WT_INT_EN);
-	ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
-	__raw_writel(ctlreg, w90p910_ts->ts_reg);
-
-	w90p910_ts->state = TS_WAIT_Y_COORD;
-}
-
-static void w90p910_prepare_next_packet(struct w90p910_ts *w90p910_ts)
-{
-	unsigned long ctlreg;
-
-	ctlreg = __raw_readl(w90p910_ts->ts_reg);
-	ctlreg &= ~(ADC_INT | ADC_INT_EN | ADC_SEMIAUTO | ADC_CONV);
-	ctlreg |= ADC_WAITTRIG | WT_INT_EN;
-	__raw_writel(ctlreg, w90p910_ts->ts_reg);
-
-	w90p910_ts->state = TS_WAIT_NEW_PACKET;
-}
-
-static irqreturn_t w90p910_ts_interrupt(int irq, void *dev_id)
-{
-	struct w90p910_ts *w90p910_ts = dev_id;
-	unsigned long flags;
-
-	spin_lock_irqsave(&w90p910_ts->lock, flags);
-
-	switch (w90p910_ts->state) {
-	case TS_WAIT_NEW_PACKET:
-		/*
-		 * The controller only generates interrupts when pen
-		 * is down.
-		 */
-		del_timer(&w90p910_ts->timer);
-		w90p910_prepare_x_reading(w90p910_ts);
-		break;
-
-
-	case TS_WAIT_X_COORD:
-		w90p910_prepare_y_reading(w90p910_ts);
-		break;
-
-	case TS_WAIT_Y_COORD:
-		w90p910_report_event(w90p910_ts, true);
-		w90p910_prepare_next_packet(w90p910_ts);
-		mod_timer(&w90p910_ts->timer, jiffies + msecs_to_jiffies(100));
-		break;
-
-	case TS_IDLE:
-		break;
-	}
-
-	spin_unlock_irqrestore(&w90p910_ts->lock, flags);
-
-	return IRQ_HANDLED;
-}
-
-static void w90p910_check_pen_up(struct timer_list *t)
-{
-	struct w90p910_ts *w90p910_ts = from_timer(w90p910_ts, t, timer);
-	unsigned long flags;
-
-	spin_lock_irqsave(&w90p910_ts->lock, flags);
-
-	if (w90p910_ts->state == TS_WAIT_NEW_PACKET &&
-	    !(__raw_readl(w90p910_ts->ts_reg + 0x04) & ADC_DOWN)) {
-
-		w90p910_report_event(w90p910_ts, false);
-	}
-
-	spin_unlock_irqrestore(&w90p910_ts->lock, flags);
-}
-
-static int w90p910_open(struct input_dev *dev)
-{
-	struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
-	unsigned long val;
-
-	/* enable the ADC clock */
-	clk_enable(w90p910_ts->clk);
-
-	__raw_writel(ADC_RST1, w90p910_ts->ts_reg);
-	msleep(1);
-	__raw_writel(ADC_RST0, w90p910_ts->ts_reg);
-	msleep(1);
-
-	/* set delay and screen type */
-	val = __raw_readl(w90p910_ts->ts_reg + 0x04);
-	__raw_writel(val & TSC_FOURWIRE, w90p910_ts->ts_reg + 0x04);
-	__raw_writel(ADC_DELAY, w90p910_ts->ts_reg + 0x08);
-
-	w90p910_ts->state = TS_WAIT_NEW_PACKET;
-	wmb();
-
-	/* set trigger mode */
-	val = __raw_readl(w90p910_ts->ts_reg);
-	val |= ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN;
-	__raw_writel(val, w90p910_ts->ts_reg);
-
-	return 0;
-}
-
-static void w90p910_close(struct input_dev *dev)
-{
-	struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
-	unsigned long val;
-
-	/* disable trigger mode */
-
-	spin_lock_irq(&w90p910_ts->lock);
-
-	w90p910_ts->state = TS_IDLE;
-
-	val = __raw_readl(w90p910_ts->ts_reg);
-	val &= ~(ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN | ADC_INT_EN);
-	__raw_writel(val, w90p910_ts->ts_reg);
-
-	spin_unlock_irq(&w90p910_ts->lock);
-
-	/* Now that interrupts are shut off we can safely delete timer */
-	del_timer_sync(&w90p910_ts->timer);
-
-	/* stop the ADC clock */
-	clk_disable(w90p910_ts->clk);
-}
-
-static int w90x900ts_probe(struct platform_device *pdev)
-{
-	struct w90p910_ts *w90p910_ts;
-	struct input_dev *input_dev;
-	struct resource *res;
-	int err;
-
-	w90p910_ts = kzalloc(sizeof(struct w90p910_ts), GFP_KERNEL);
-	input_dev = input_allocate_device();
-	if (!w90p910_ts || !input_dev) {
-		err = -ENOMEM;
-		goto fail1;
-	}
-
-	w90p910_ts->input = input_dev;
-	w90p910_ts->state = TS_IDLE;
-	spin_lock_init(&w90p910_ts->lock);
-	timer_setup(&w90p910_ts->timer, w90p910_check_pen_up, 0);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		err = -ENXIO;
-		goto fail1;
-	}
-
-	if (!request_mem_region(res->start, resource_size(res),
-				pdev->name)) {
-		err = -EBUSY;
-		goto fail1;
-	}
-
-	w90p910_ts->ts_reg = ioremap(res->start, resource_size(res));
-	if (!w90p910_ts->ts_reg) {
-		err = -ENOMEM;
-		goto fail2;
-	}
-
-	w90p910_ts->clk = clk_get(&pdev->dev, NULL);
-	if (IS_ERR(w90p910_ts->clk)) {
-		err = PTR_ERR(w90p910_ts->clk);
-		goto fail3;
-	}
-
-	input_dev->name = "W90P910 TouchScreen";
-	input_dev->phys = "w90p910ts/event0";
-	input_dev->id.bustype = BUS_HOST;
-	input_dev->id.vendor  = 0x0005;
-	input_dev->id.product = 0x0001;
-	input_dev->id.version = 0x0100;
-	input_dev->dev.parent = &pdev->dev;
-	input_dev->open = w90p910_open;
-	input_dev->close = w90p910_close;
-
-	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
-	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
-
-	input_set_abs_params(input_dev, ABS_X, 0, 0x400, 0, 0);
-	input_set_abs_params(input_dev, ABS_Y, 0, 0x400, 0, 0);
-
-	input_set_drvdata(input_dev, w90p910_ts);
-
-	w90p910_ts->irq_num = platform_get_irq(pdev, 0);
-	if (request_irq(w90p910_ts->irq_num, w90p910_ts_interrupt,
-			0, "w90p910ts", w90p910_ts)) {
-		err = -EBUSY;
-		goto fail4;
-	}
-
-	err = input_register_device(w90p910_ts->input);
-	if (err)
-		goto fail5;
-
-	platform_set_drvdata(pdev, w90p910_ts);
-
-	return 0;
-
-fail5:	free_irq(w90p910_ts->irq_num, w90p910_ts);
-fail4:	clk_put(w90p910_ts->clk);
-fail3:	iounmap(w90p910_ts->ts_reg);
-fail2:	release_mem_region(res->start, resource_size(res));
-fail1:	input_free_device(input_dev);
-	kfree(w90p910_ts);
-	return err;
-}
-
-static int w90x900ts_remove(struct platform_device *pdev)
-{
-	struct w90p910_ts *w90p910_ts = platform_get_drvdata(pdev);
-	struct resource *res;
-
-	free_irq(w90p910_ts->irq_num, w90p910_ts);
-	del_timer_sync(&w90p910_ts->timer);
-	iounmap(w90p910_ts->ts_reg);
-
-	clk_put(w90p910_ts->clk);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(res->start, resource_size(res));
-
-	input_unregister_device(w90p910_ts->input);
-	kfree(w90p910_ts);
-
-	return 0;
-}
-
-static struct platform_driver w90x900ts_driver = {
-	.probe		= w90x900ts_probe,
-	.remove		= w90x900ts_remove,
-	.driver		= {
-		.name	= "nuc900-ts",
-	},
-};
-module_platform_driver(w90x900ts_driver);
-
-MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
-MODULE_DESCRIPTION("w90p910 touch screen driver!");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:nuc900-ts");
-- 
2.20.0

