Input: remove atmel-wm97xx touchscreen driver

Since AVR32 arch is gone, atmel-wm97xx driver is useless. In theory it
could have been rewritten to work with AT91 devices, but the driver is from
the platform data era, and a bit hard coded to work on AVR32 hardware
variant of the AC97C peripheral, so let's remove it.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/Kconfig

@@ -795,21 +795,6 @@ config TOUCHSCREEN_WM9713
 	  Say Y here to enable support for the Wolfson Microelectronics
 	  WM9713 touchscreen controller.
 
-config TOUCHSCREEN_WM97XX_ATMEL
-	tristate "WM97xx Atmel accelerated touch"
-	depends on TOUCHSCREEN_WM97XX && AVR32
-	help
-	  Say Y here for support for streaming mode with WM97xx touchscreens
-	  on Atmel AT91 or AVR32 systems with an AC97C module.
-
-	  Be aware that this will use channel B in the controller for
-	  streaming data, this must not conflict with other AC97C drivers.
-
-	  If unsure, say N.
-
-	  To compile this driver as a module, choose M here: the module will
-	  be called atmel-wm97xx.
-
 config TOUCHSCREEN_WM97XX_MAINSTONE
 	tristate "WM97xx Mainstone/Palm accelerated touch"
 	depends on TOUCHSCREEN_WM97XX && ARCH_PXA

drivers/input/touchscreen/Makefile

@@ -97,7 +97,6 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX)	+= wm97xx-ts.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705)	+= wm9705.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712)	+= wm9712.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713)	+= wm9713.o
-obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL)	+= atmel-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE)	+= mainstone-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE)	+= zylonite-wm97xx.o
 obj-$(CONFIG_TOUCHSCREEN_W90X900)	+= w90p910_ts.o

drivers/input/touchscreen/atmel-wm97xx.c

@@ -1,436 +0,0 @@
-/*
- * Atmel AT91 and AVR32 continuous touch screen driver for Wolfson WM97xx AC97
- * codecs.
- *
- * Copyright (C) 2008 - 2009 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- */
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/irq.h>
-#include <linux/interrupt.h>
-#include <linux/wm97xx.h>
-#include <linux/timer.h>
-#include <linux/gpio.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-
-#define AC97C_ICA		0x10
-#define AC97C_CBRHR		0x30
-#define AC97C_CBSR		0x38
-#define AC97C_CBMR		0x3c
-#define AC97C_IER		0x54
-#define AC97C_IDR		0x58
-
-#define AC97C_RXRDY		(1 << 4)
-#define AC97C_OVRUN		(1 << 5)
-
-#define AC97C_CMR_SIZE_20	(0 << 16)
-#define AC97C_CMR_SIZE_18	(1 << 16)
-#define AC97C_CMR_SIZE_16	(2 << 16)
-#define AC97C_CMR_SIZE_10	(3 << 16)
-#define AC97C_CMR_CEM_LITTLE	(1 << 18)
-#define AC97C_CMR_CEM_BIG	(0 << 18)
-#define AC97C_CMR_CENA		(1 << 21)
-
-#define AC97C_INT_CBEVT		(1 << 4)
-
-#define AC97C_SR_CAEVT		(1 << 3)
-
-#define AC97C_CH_MASK(slot)						\
-	(0x7 << (3 * (slot - 3)))
-#define AC97C_CH_ASSIGN(slot, channel)					\
-	(AC97C_CHANNEL_##channel << (3 * (slot - 3)))
-#define AC97C_CHANNEL_NONE	0x0
-#define AC97C_CHANNEL_B		0x2
-
-#define ac97c_writel(chip, reg, val)			\
-	__raw_writel((val), (chip)->regs + AC97C_##reg)
-#define ac97c_readl(chip, reg)				\
-	__raw_readl((chip)->regs + AC97C_##reg)
-
-#ifdef CONFIG_CPU_AT32AP700X
-#define ATMEL_WM97XX_AC97C_IOMEM	(0xfff02800)
-#define ATMEL_WM97XX_AC97C_IRQ		(29)
-#define ATMEL_WM97XX_GPIO_DEFAULT	(32+16) /* Pin 16 on port B. */
-#else
-#error Unknown CPU, this driver only supports AT32AP700X CPUs.
-#endif
-
-struct continuous {
-	u16 id;    /* codec id */
-	u8 code;   /* continuous code */
-	u8 reads;  /* number of coord reads per read cycle */
-	u32 speed; /* number of coords per second */
-};
-
-#define WM_READS(sp) ((sp / HZ) + 1)
-
-static const struct continuous cinfo[] = {
-	{WM9705_ID2, 0, WM_READS(94), 94},
-	{WM9705_ID2, 1, WM_READS(188), 188},
-	{WM9705_ID2, 2, WM_READS(375), 375},
-	{WM9705_ID2, 3, WM_READS(750), 750},
-	{WM9712_ID2, 0, WM_READS(94), 94},
-	{WM9712_ID2, 1, WM_READS(188), 188},
-	{WM9712_ID2, 2, WM_READS(375), 375},
-	{WM9712_ID2, 3, WM_READS(750), 750},
-	{WM9713_ID2, 0, WM_READS(94), 94},
-	{WM9713_ID2, 1, WM_READS(120), 120},
-	{WM9713_ID2, 2, WM_READS(154), 154},
-	{WM9713_ID2, 3, WM_READS(188), 188},
-};
-
-/* Continuous speed index. */
-static int sp_idx;
-
-/*
- * Pen sampling frequency (Hz) in continuous mode.
- */
-static int cont_rate = 188;
-module_param(cont_rate, int, 0);
-MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
-
-/*
- * Pen down detection.
- *
- * This driver can either poll or use an interrupt to indicate a pen down
- * event. If the irq request fails then it will fall back to polling mode.
- */
-static int pen_int = 1;
-module_param(pen_int, int, 0);
-MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
-
-/*
- * Pressure readback.
- *
- * Set to 1 to read back pen down pressure.
- */
-static int pressure;
-module_param(pressure, int, 0);
-MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
-
-/*
- * AC97 touch data slot.
- *
- * Touch screen readback data ac97 slot.
- */
-static int ac97_touch_slot = 5;
-module_param(ac97_touch_slot, int, 0);
-MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
-
-/*
- * GPIO line number.
- *
- * Set to GPIO number where the signal from the WM97xx device is hooked up.
- */
-static int atmel_gpio_line = ATMEL_WM97XX_GPIO_DEFAULT;
-module_param(atmel_gpio_line, int, 0);
-MODULE_PARM_DESC(atmel_gpio_line, "GPIO line number connected to WM97xx");
-
-struct atmel_wm97xx {
-	struct wm97xx		*wm;
-	struct timer_list	pen_timer;
-	void __iomem		*regs;
-	unsigned long		ac97c_irq;
-	unsigned long		gpio_pen;
-	unsigned long		gpio_irq;
-	unsigned short		x;
-	unsigned short		y;
-};
-
-static irqreturn_t atmel_wm97xx_channel_b_interrupt(int irq, void *dev_id)
-{
-	struct atmel_wm97xx *atmel_wm97xx = dev_id;
-	struct wm97xx *wm = atmel_wm97xx->wm;
-	int status = ac97c_readl(atmel_wm97xx, CBSR);
-	irqreturn_t retval = IRQ_NONE;
-
-	if (status & AC97C_OVRUN) {
-		dev_dbg(&wm->touch_dev->dev, "AC97C overrun\n");
-		ac97c_readl(atmel_wm97xx, CBRHR);
-		retval = IRQ_HANDLED;
-	} else if (status & AC97C_RXRDY) {
-		u16 data;
-		u16 value;
-		u16 source;
-		u16 pen_down;
-
-		data = ac97c_readl(atmel_wm97xx, CBRHR);
-		value = data & 0x0fff;
-		source = data & WM97XX_ADCSEL_MASK;
-		pen_down = (data & WM97XX_PEN_DOWN) >> 8;
-
-		if (source == WM97XX_ADCSEL_X)
-			atmel_wm97xx->x = value;
-		if (source == WM97XX_ADCSEL_Y)
-			atmel_wm97xx->y = value;
-
-		if (!pressure && source == WM97XX_ADCSEL_Y) {
-			input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
-			input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
-			input_report_key(wm->input_dev, BTN_TOUCH, pen_down);
-			input_sync(wm->input_dev);
-		} else if (pressure && source == WM97XX_ADCSEL_PRES) {
-			input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
-			input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
-			input_report_abs(wm->input_dev, ABS_PRESSURE, value);
-			input_report_key(wm->input_dev, BTN_TOUCH, value);
-			input_sync(wm->input_dev);
-		}
-
-		retval = IRQ_HANDLED;
-	}
-
-	return retval;
-}
-
-static void atmel_wm97xx_acc_pen_up(struct wm97xx *wm)
-{
-	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
-	struct input_dev *input_dev = wm->input_dev;
-	int pen_down = gpio_get_value(atmel_wm97xx->gpio_pen);
-
-	if (pen_down != 0) {
-		mod_timer(&atmel_wm97xx->pen_timer,
-			  jiffies + msecs_to_jiffies(1));
-	} else {
-		if (pressure)
-			input_report_abs(input_dev, ABS_PRESSURE, 0);
-		input_report_key(input_dev, BTN_TOUCH, 0);
-		input_sync(input_dev);
-	}
-}
-
-static void atmel_wm97xx_pen_timer(struct timer_list *t)
-{
-	struct atmel_wm97xx *atmel_wm97xx = from_timer(atmel_wm97xx, t,
-						       pen_timer);
-
-	atmel_wm97xx_acc_pen_up(atmel_wm97xx->wm);
-}
-
-static int atmel_wm97xx_acc_startup(struct wm97xx *wm)
-{
-	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
-	int idx = 0;
-
-	if (wm->ac97 == NULL)
-		return -ENODEV;
-
-	for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
-		if (wm->id != cinfo[idx].id)
-			continue;
-
-		sp_idx = idx;
-
-		if (cont_rate <= cinfo[idx].speed)
-			break;
-	}
-
-	wm->acc_rate = cinfo[sp_idx].code;
-	wm->acc_slot = ac97_touch_slot;
-	dev_info(&wm->touch_dev->dev, "atmel accelerated touchscreen driver, "
-			"%d samples/sec\n", cinfo[sp_idx].speed);
-
-	if (pen_int) {
-		unsigned long reg;
-
-		wm->pen_irq = atmel_wm97xx->gpio_irq;
-
-		switch (wm->id) {
-		case WM9712_ID2: /* Fall through. */
-		case WM9713_ID2:
-			/*
-			 * Use GPIO 13 (PEN_DOWN) to assert GPIO line 3
-			 * (PENDOWN).
-			 */
-			wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
-					WM97XX_GPIO_POL_HIGH,
-					WM97XX_GPIO_STICKY,
-					WM97XX_GPIO_WAKE);
-			wm97xx_config_gpio(wm, WM97XX_GPIO_3, WM97XX_GPIO_OUT,
-					WM97XX_GPIO_POL_HIGH,
-					WM97XX_GPIO_NOTSTICKY,
-					WM97XX_GPIO_NOWAKE);
-		case WM9705_ID2: /* Fall through. */
-			/*
-			 * Enable touch data slot in AC97 controller channel B.
-			 */
-			reg = ac97c_readl(atmel_wm97xx, ICA);
-			reg &= ~AC97C_CH_MASK(wm->acc_slot);
-			reg |= AC97C_CH_ASSIGN(wm->acc_slot, B);
-			ac97c_writel(atmel_wm97xx, ICA, reg);
-
-			/*
-			 * Enable channel and interrupt for RXRDY and OVERRUN.
-			 */
-			ac97c_writel(atmel_wm97xx, CBMR, AC97C_CMR_CENA
-					| AC97C_CMR_CEM_BIG
-					| AC97C_CMR_SIZE_16
-					| AC97C_OVRUN
-					| AC97C_RXRDY);
-			/* Dummy read to empty RXRHR. */
-			ac97c_readl(atmel_wm97xx, CBRHR);
-			/*
-			 * Enable interrupt for channel B in the AC97
-			 * controller.
-			 */
-			ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
-			break;
-		default:
-			dev_err(&wm->touch_dev->dev, "pen down irq not "
-					"supported on this device\n");
-			pen_int = 0;
-			break;
-		}
-	}
-
-	return 0;
-}
-
-static void atmel_wm97xx_acc_shutdown(struct wm97xx *wm)
-{
-	if (pen_int) {
-		struct atmel_wm97xx *atmel_wm97xx =
-			platform_get_drvdata(wm->touch_dev);
-		unsigned long ica;
-
-		switch (wm->id & 0xffff) {
-		case WM9705_ID2: /* Fall through. */
-		case WM9712_ID2: /* Fall through. */
-		case WM9713_ID2:
-			/* Disable slot and turn off channel B interrupts. */
-			ica = ac97c_readl(atmel_wm97xx, ICA);
-			ica &= ~AC97C_CH_MASK(wm->acc_slot);
-			ac97c_writel(atmel_wm97xx, ICA, ica);
-			ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
-			ac97c_writel(atmel_wm97xx, CBMR, 0);
-			wm->pen_irq = 0;
-			break;
-		default:
-			dev_err(&wm->touch_dev->dev, "unknown codec\n");
-			break;
-		}
-	}
-}
-
-static void atmel_wm97xx_irq_enable(struct wm97xx *wm, int enable)
-{
-	/* Intentionally left empty. */
-}
-
-static struct wm97xx_mach_ops atmel_mach_ops = {
-	.acc_enabled	= 1,
-	.acc_pen_up	= atmel_wm97xx_acc_pen_up,
-	.acc_startup	= atmel_wm97xx_acc_startup,
-	.acc_shutdown	= atmel_wm97xx_acc_shutdown,
-	.irq_enable	= atmel_wm97xx_irq_enable,
-	.irq_gpio	= WM97XX_GPIO_3,
-};
-
-static int __init atmel_wm97xx_probe(struct platform_device *pdev)
-{
-	struct wm97xx *wm = platform_get_drvdata(pdev);
-	struct atmel_wm97xx *atmel_wm97xx;
-	int ret;
-
-	atmel_wm97xx = kzalloc(sizeof(struct atmel_wm97xx), GFP_KERNEL);
-	if (!atmel_wm97xx)
-		return -ENOMEM;
-
-	atmel_wm97xx->wm	= wm;
-	atmel_wm97xx->regs	= (void *)ATMEL_WM97XX_AC97C_IOMEM;
-	atmel_wm97xx->ac97c_irq	= ATMEL_WM97XX_AC97C_IRQ;
-	atmel_wm97xx->gpio_pen	= atmel_gpio_line;
-	atmel_wm97xx->gpio_irq	= gpio_to_irq(atmel_wm97xx->gpio_pen);
-
-	timer_setup(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer, 0);
-
-	ret = request_irq(atmel_wm97xx->ac97c_irq,
-			  atmel_wm97xx_channel_b_interrupt,
-			  IRQF_SHARED, "atmel-wm97xx-ch-b", atmel_wm97xx);
-	if (ret) {
-		dev_dbg(&pdev->dev, "could not request ac97c irq\n");
-		goto err;
-	}
-
-	platform_set_drvdata(pdev, atmel_wm97xx);
-
-	ret = wm97xx_register_mach_ops(wm, &atmel_mach_ops);
-	if (ret)
-		goto err_irq;
-
-	return ret;
-
-err_irq:
-	free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
-err:
-	kfree(atmel_wm97xx);
-	return ret;
-}
-
-static int __exit atmel_wm97xx_remove(struct platform_device *pdev)
-{
-	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
-	struct wm97xx *wm = atmel_wm97xx->wm;
-
-	ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
-	free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
-	del_timer_sync(&atmel_wm97xx->pen_timer);
-	wm97xx_unregister_mach_ops(wm);
-	kfree(atmel_wm97xx);
-
-	return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int atmel_wm97xx_suspend(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
-
-	ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
-	disable_irq(atmel_wm97xx->gpio_irq);
-	del_timer_sync(&atmel_wm97xx->pen_timer);
-
-	return 0;
-}
-
-static int atmel_wm97xx_resume(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
-	struct wm97xx *wm = atmel_wm97xx->wm;
-
-	if (wm->input_dev->users) {
-		enable_irq(atmel_wm97xx->gpio_irq);
-		ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
-	}
-
-	return 0;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(atmel_wm97xx_pm_ops,
-			 atmel_wm97xx_suspend, atmel_wm97xx_resume);
-
-static struct platform_driver atmel_wm97xx_driver = {
-	.remove		= __exit_p(atmel_wm97xx_remove),
-	.driver		= {
-		.name	= "wm97xx-touch",
-		.pm	= &atmel_wm97xx_pm_ops,
-	},
-};
-
-module_platform_driver_probe(atmel_wm97xx_driver, atmel_wm97xx_probe);
-
-MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
-MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32");
-MODULE_LICENSE("GPL");