iio: adc: Move mxs-lradc out of staging

Move mxs-lradc driver from drivers/staging/iio/adc to drivers/iio/adc.

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 0 insertions, 1770 deletions

diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
deleted file mode 100644
index bb1f15224ac8..000000000000
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ /dev/null
@@ -1,1770 +0,0 @@
-/*
- * Freescale MXS LRADC driver
- *
- * Copyright (c) 2012 DENX Software Engineering, GmbH.
- * Marek Vasut <marex@denx.de>
- *
- * 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.
- */
-
-#include <linux/bitops.h>
-#include <linux/clk.h>
-#include <linux/completion.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/stmp_device.h>
-#include <linux/sysfs.h>
-
-#include <linux/iio/buffer.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/trigger.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/triggered_buffer.h>
-#include <linux/iio/sysfs.h>
-
-#define DRIVER_NAME		"mxs-lradc"
-
-#define LRADC_MAX_DELAY_CHANS	4
-#define LRADC_MAX_MAPPED_CHANS	8
-#define LRADC_MAX_TOTAL_CHANS	16
-
-#define LRADC_DELAY_TIMER_HZ	2000
-
-/*
- * Make this runtime configurable if necessary. Currently, if the buffered mode
- * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
- * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
- * seconds. The result is that the samples arrive every 500mS.
- */
-#define LRADC_DELAY_TIMER_PER	200
-#define LRADC_DELAY_TIMER_LOOP	5
-
-/*
- * Once the pen touches the touchscreen, the touchscreen switches from
- * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
- * is realized by worker thread, which is called every 20 or so milliseconds.
- * This gives the touchscreen enough fluency and does not strain the system
- * too much.
- */
-#define LRADC_TS_SAMPLE_DELAY_MS	5
-
-/*
- * The LRADC reads the following amount of samples from each touchscreen
- * channel and the driver then computes average of these.
- */
-#define LRADC_TS_SAMPLE_AMOUNT		4
-
-enum mxs_lradc_id {
-	IMX23_LRADC,
-	IMX28_LRADC,
-};
-
-static const char * const mx23_lradc_irq_names[] = {
-	"mxs-lradc-touchscreen",
-	"mxs-lradc-channel0",
-	"mxs-lradc-channel1",
-	"mxs-lradc-channel2",
-	"mxs-lradc-channel3",
-	"mxs-lradc-channel4",
-	"mxs-lradc-channel5",
-	"mxs-lradc-channel6",
-	"mxs-lradc-channel7",
-};
-
-static const char * const mx28_lradc_irq_names[] = {
-	"mxs-lradc-touchscreen",
-	"mxs-lradc-thresh0",
-	"mxs-lradc-thresh1",
-	"mxs-lradc-channel0",
-	"mxs-lradc-channel1",
-	"mxs-lradc-channel2",
-	"mxs-lradc-channel3",
-	"mxs-lradc-channel4",
-	"mxs-lradc-channel5",
-	"mxs-lradc-channel6",
-	"mxs-lradc-channel7",
-	"mxs-lradc-button0",
-	"mxs-lradc-button1",
-};
-
-struct mxs_lradc_of_config {
-	const int		irq_count;
-	const char * const	*irq_name;
-	const u32		*vref_mv;
-};
-
-#define VREF_MV_BASE 1850
-
-static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
-	VREF_MV_BASE,		/* CH0 */
-	VREF_MV_BASE,		/* CH1 */
-	VREF_MV_BASE,		/* CH2 */
-	VREF_MV_BASE,		/* CH3 */
-	VREF_MV_BASE,		/* CH4 */
-	VREF_MV_BASE,		/* CH5 */
-	VREF_MV_BASE * 2,	/* CH6 VDDIO */
-	VREF_MV_BASE * 4,	/* CH7 VBATT */
-	VREF_MV_BASE,		/* CH8 Temp sense 0 */
-	VREF_MV_BASE,		/* CH9 Temp sense 1 */
-	VREF_MV_BASE,		/* CH10 */
-	VREF_MV_BASE,		/* CH11 */
-	VREF_MV_BASE,		/* CH12 USB_DP */
-	VREF_MV_BASE,		/* CH13 USB_DN */
-	VREF_MV_BASE,		/* CH14 VBG */
-	VREF_MV_BASE * 4,	/* CH15 VDD5V */
-};
-
-static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
-	VREF_MV_BASE,		/* CH0 */
-	VREF_MV_BASE,		/* CH1 */
-	VREF_MV_BASE,		/* CH2 */
-	VREF_MV_BASE,		/* CH3 */
-	VREF_MV_BASE,		/* CH4 */
-	VREF_MV_BASE,		/* CH5 */
-	VREF_MV_BASE,		/* CH6 */
-	VREF_MV_BASE * 4,	/* CH7 VBATT */
-	VREF_MV_BASE,		/* CH8 Temp sense 0 */
-	VREF_MV_BASE,		/* CH9 Temp sense 1 */
-	VREF_MV_BASE * 2,	/* CH10 VDDIO */
-	VREF_MV_BASE,		/* CH11 VTH */
-	VREF_MV_BASE * 2,	/* CH12 VDDA */
-	VREF_MV_BASE,		/* CH13 VDDD */
-	VREF_MV_BASE,		/* CH14 VBG */
-	VREF_MV_BASE * 4,	/* CH15 VDD5V */
-};
-
-static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
-	[IMX23_LRADC] = {
-		.irq_count	= ARRAY_SIZE(mx23_lradc_irq_names),
-		.irq_name	= mx23_lradc_irq_names,
-		.vref_mv	= mx23_vref_mv,
-	},
-	[IMX28_LRADC] = {
-		.irq_count	= ARRAY_SIZE(mx28_lradc_irq_names),
-		.irq_name	= mx28_lradc_irq_names,
-		.vref_mv	= mx28_vref_mv,
-	},
-};
-
-enum mxs_lradc_ts {
-	MXS_LRADC_TOUCHSCREEN_NONE = 0,
-	MXS_LRADC_TOUCHSCREEN_4WIRE,
-	MXS_LRADC_TOUCHSCREEN_5WIRE,
-};
-
-/*
- * Touchscreen handling
- */
-enum lradc_ts_plate {
-	LRADC_TOUCH = 0,
-	LRADC_SAMPLE_X,
-	LRADC_SAMPLE_Y,
-	LRADC_SAMPLE_PRESSURE,
-	LRADC_SAMPLE_VALID,
-};
-
-enum mxs_lradc_divbytwo {
-	MXS_LRADC_DIV_DISABLED = 0,
-	MXS_LRADC_DIV_ENABLED,
-};
-
-struct mxs_lradc_scale {
-	unsigned int		integer;
-	unsigned int		nano;
-};
-
-struct mxs_lradc {
-	struct device		*dev;
-	void __iomem		*base;
-	int			irq[13];
-
-	struct clk		*clk;
-
-	u32			*buffer;
-	struct iio_trigger	*trig;
-
-	struct mutex		lock;
-
-	struct completion	completion;
-
-	const u32		*vref_mv;
-	struct mxs_lradc_scale	scale_avail[LRADC_MAX_TOTAL_CHANS][2];
-	unsigned long		is_divided;
-
-	/*
-	 * When the touchscreen is enabled, we give it two private virtual
-	 * channels: #6 and #7. This means that only 6 virtual channels (instead
-	 * of 8) will be available for buffered capture.
-	 */
-#define TOUCHSCREEN_VCHANNEL1		7
-#define TOUCHSCREEN_VCHANNEL2		6
-#define BUFFER_VCHANS_LIMITED		0x3f
-#define BUFFER_VCHANS_ALL		0xff
-	u8			buffer_vchans;
-
-	/*
-	 * Furthermore, certain LRADC channels are shared between touchscreen
-	 * and/or touch-buttons and generic LRADC block. Therefore when using
-	 * either of these, these channels are not available for the regular
-	 * sampling. The shared channels are as follows:
-	 *
-	 * CH0 -- Touch button #0
-	 * CH1 -- Touch button #1
-	 * CH2 -- Touch screen XPUL
-	 * CH3 -- Touch screen YPLL
-	 * CH4 -- Touch screen XNUL
-	 * CH5 -- Touch screen YNLR
-	 * CH6 -- Touch screen WIPER (5-wire only)
-	 *
-	 * The bit fields below represents which parts of the LRADC block are
-	 * switched into special mode of operation. These channels can not
-	 * be sampled as regular LRADC channels. The driver will refuse any
-	 * attempt to sample these channels.
-	 */
-#define CHAN_MASK_TOUCHBUTTON		(BIT(1) | BIT(0))
-#define CHAN_MASK_TOUCHSCREEN_4WIRE	(0xf << 2)
-#define CHAN_MASK_TOUCHSCREEN_5WIRE	(0x1f << 2)
-	enum mxs_lradc_ts	use_touchscreen;
-	bool			use_touchbutton;
-
-	struct input_dev	*ts_input;
-
-	enum mxs_lradc_id	soc;
-	enum lradc_ts_plate	cur_plate; /* state machine */
-	bool			ts_valid;
-	unsigned		ts_x_pos;
-	unsigned		ts_y_pos;
-	unsigned		ts_pressure;
-
-	/* handle touchscreen's physical behaviour */
-	/* samples per coordinate */
-	unsigned		over_sample_cnt;
-	/* time clocks between samples */
-	unsigned		over_sample_delay;
-	/* time in clocks to wait after the plates where switched */
-	unsigned		settling_delay;
-};
-
-#define	LRADC_CTRL0				0x00
-# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE	BIT(23)
-# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE	BIT(22)
-# define LRADC_CTRL0_MX28_YNNSW	/* YM */	BIT(21)
-# define LRADC_CTRL0_MX28_YPNSW	/* YP */	BIT(20)
-# define LRADC_CTRL0_MX28_YPPSW	/* YP */	BIT(19)
-# define LRADC_CTRL0_MX28_XNNSW	/* XM */	BIT(18)
-# define LRADC_CTRL0_MX28_XNPSW	/* XM */	BIT(17)
-# define LRADC_CTRL0_MX28_XPPSW	/* XP */	BIT(16)
-
-# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE	BIT(20)
-# define LRADC_CTRL0_MX23_YM			BIT(19)
-# define LRADC_CTRL0_MX23_XM			BIT(18)
-# define LRADC_CTRL0_MX23_YP			BIT(17)
-# define LRADC_CTRL0_MX23_XP			BIT(16)
-
-# define LRADC_CTRL0_MX28_PLATE_MASK \
-		(LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
-		LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
-		LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
-		LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
-
-# define LRADC_CTRL0_MX23_PLATE_MASK \
-		(LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
-		LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
-		LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
-
-#define	LRADC_CTRL1				0x10
-#define	LRADC_CTRL1_TOUCH_DETECT_IRQ_EN		BIT(24)
-#define	LRADC_CTRL1_LRADC_IRQ_EN(n)		(1 << ((n) + 16))
-#define	LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK	(0x1fff << 16)
-#define	LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK	(0x01ff << 16)
-#define	LRADC_CTRL1_LRADC_IRQ_EN_OFFSET		16
-#define	LRADC_CTRL1_TOUCH_DETECT_IRQ		BIT(8)
-#define	LRADC_CTRL1_LRADC_IRQ(n)		(1 << (n))
-#define	LRADC_CTRL1_MX28_LRADC_IRQ_MASK		0x1fff
-#define	LRADC_CTRL1_MX23_LRADC_IRQ_MASK		0x01ff
-#define	LRADC_CTRL1_LRADC_IRQ_OFFSET		0
-
-#define	LRADC_CTRL2				0x20
-#define	LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET	24
-#define	LRADC_CTRL2_TEMPSENSE_PWD		BIT(15)
-
-#define	LRADC_STATUS				0x40
-#define	LRADC_STATUS_TOUCH_DETECT_RAW		BIT(0)
-
-#define	LRADC_CH(n)				(0x50 + (0x10 * (n)))
-#define	LRADC_CH_ACCUMULATE			BIT(29)
-#define	LRADC_CH_NUM_SAMPLES_MASK		(0x1f << 24)
-#define	LRADC_CH_NUM_SAMPLES_OFFSET		24
-#define	LRADC_CH_NUM_SAMPLES(x) \
-				((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
-#define	LRADC_CH_VALUE_MASK			0x3ffff
-#define	LRADC_CH_VALUE_OFFSET			0
-
-#define	LRADC_DELAY(n)				(0xd0 + (0x10 * (n)))
-#define	LRADC_DELAY_TRIGGER_LRADCS_MASK		(0xffUL << 24)
-#define	LRADC_DELAY_TRIGGER_LRADCS_OFFSET	24
-#define	LRADC_DELAY_TRIGGER(x) \
-				(((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
-				LRADC_DELAY_TRIGGER_LRADCS_MASK)
-#define	LRADC_DELAY_KICK			BIT(20)
-#define	LRADC_DELAY_TRIGGER_DELAYS_MASK		(0xf << 16)
-#define	LRADC_DELAY_TRIGGER_DELAYS_OFFSET	16
-#define	LRADC_DELAY_TRIGGER_DELAYS(x) \
-				(((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
-				LRADC_DELAY_TRIGGER_DELAYS_MASK)
-#define	LRADC_DELAY_LOOP_COUNT_MASK		(0x1f << 11)
-#define	LRADC_DELAY_LOOP_COUNT_OFFSET		11
-#define	LRADC_DELAY_LOOP(x) \
-				(((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
-				LRADC_DELAY_LOOP_COUNT_MASK)
-#define	LRADC_DELAY_DELAY_MASK			0x7ff
-#define	LRADC_DELAY_DELAY_OFFSET		0
-#define	LRADC_DELAY_DELAY(x) \
-				(((x) << LRADC_DELAY_DELAY_OFFSET) & \
-				LRADC_DELAY_DELAY_MASK)
-
-#define	LRADC_CTRL4				0x140
-#define	LRADC_CTRL4_LRADCSELECT_MASK(n)		(0xf << ((n) * 4))
-#define	LRADC_CTRL4_LRADCSELECT_OFFSET(n)	((n) * 4)
-#define	LRADC_CTRL4_LRADCSELECT(n, x) \
-				(((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
-				LRADC_CTRL4_LRADCSELECT_MASK(n))
-
-#define LRADC_RESOLUTION			12
-#define LRADC_SINGLE_SAMPLE_MASK		((1 << LRADC_RESOLUTION) - 1)
-
-static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
-	writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
-}
-
-static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
-	writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
-}
-
-static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
-	writel(val, lradc->base + reg);
-}
-
-static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
-{
-	if (lradc->soc == IMX23_LRADC)
-		return LRADC_CTRL0_MX23_PLATE_MASK;
-	return LRADC_CTRL0_MX28_PLATE_MASK;
-}
-
-static u32 mxs_lradc_irq_en_mask(struct mxs_lradc *lradc)
-{
-	if (lradc->soc == IMX23_LRADC)
-		return LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK;
-	return LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK;
-}
-
-static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
-{
-	if (lradc->soc == IMX23_LRADC)
-		return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
-	return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
-}
-
-static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
-{
-	if (lradc->soc == IMX23_LRADC)
-		return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
-	return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
-}
-
-static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
-{
-	if (lradc->soc == IMX23_LRADC)
-		return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
-	return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
-}
-
-static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
-{
-	if (lradc->soc == IMX23_LRADC)
-		return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
-	return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
-}
-
-static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
-{
-	if (lradc->soc == IMX23_LRADC)
-		return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
-	return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
-}
-
-static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
-{
-	return !!(readl(lradc->base + LRADC_STATUS) &
-					LRADC_STATUS_TOUCH_DETECT_RAW);
-}
-
-static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
-				  unsigned ch)
-{
-	mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
-			    LRADC_CTRL4);
-	mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
-}
-
-static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
-{
-	/*
-	 * prepare for oversampling conversion
-	 *
-	 * from the datasheet:
-	 * "The ACCUMULATE bit in the appropriate channel register
-	 * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
-	 * otherwise, the IRQs will not fire."
-	 */
-	mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
-			  LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
-			  LRADC_CH(ch));
-
-	/* from the datasheet:
-	 * "Software must clear this register in preparation for a
-	 * multi-cycle accumulation.
-	 */
-	mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
-
-	/*
-	 * prepare the delay/loop unit according to the oversampling count
-	 *
-	 * from the datasheet:
-	 * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
-	 * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
-	 * the LRADC will not trigger the delay group."
-	 */
-	mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
-			  LRADC_DELAY_TRIGGER_DELAYS(0) |
-			  LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
-			  LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
-			  LRADC_DELAY(3));
-
-	mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
-
-	/*
-	 * after changing the touchscreen plates setting
-	 * the signals need some initial time to settle. Start the
-	 * SoC's delay unit and start the conversion later
-	 * and automatically.
-	 */
-	mxs_lradc_reg_wrt(
-		lradc,
-		LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
-		LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
-		LRADC_DELAY_KICK |
-		LRADC_DELAY_DELAY(lradc->settling_delay),
-		LRADC_DELAY(2));
-}
-
-/*
- * Pressure detection is special:
- * We want to do both required measurements for the pressure detection in
- * one turn. Use the hardware features to chain both conversions and let the
- * hardware report one interrupt if both conversions are done
- */
-static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
-					unsigned ch2)
-{
-	u32 reg;
-
-	/*
-	 * prepare for oversampling conversion
-	 *
-	 * from the datasheet:
-	 * "The ACCUMULATE bit in the appropriate channel register
-	 * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
-	 * otherwise, the IRQs will not fire."
-	 */
-	reg = LRADC_CH_ACCUMULATE |
-		LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
-	mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
-	mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
-
-	/* from the datasheet:
-	 * "Software must clear this register in preparation for a
-	 * multi-cycle accumulation.
-	 */
-	mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
-	mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
-
-	/* prepare the delay/loop unit according to the oversampling count */
-	mxs_lradc_reg_wrt(
-		    lradc,
-		    LRADC_DELAY_TRIGGER(1 << ch1) |
-		    LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
-		    LRADC_DELAY_TRIGGER_DELAYS(0) |
-		    LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
-		    LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
-		    LRADC_DELAY(3));
-
-	mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
-
-	/*
-	 * after changing the touchscreen plates setting
-	 * the signals need some initial time to settle. Start the
-	 * SoC's delay unit and start the conversion later
-	 * and automatically.
-	 */
-	mxs_lradc_reg_wrt(
-		lradc,
-		LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
-		LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
-		LRADC_DELAY_KICK |
-		LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
-}
-
-static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
-					   unsigned channel)
-{
-	u32 reg;
-	unsigned num_samples, val;
-
-	reg = readl(lradc->base + LRADC_CH(channel));
-	if (reg & LRADC_CH_ACCUMULATE)
-		num_samples = lradc->over_sample_cnt;
-	else
-		num_samples = 1;
-
-	val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
-	return val / num_samples;
-}
-
-static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
-					   unsigned ch1, unsigned ch2)
-{
-	u32 reg, mask;
-	unsigned pressure, m1, m2;
-
-	mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
-	reg = readl(lradc->base + LRADC_CTRL1) & mask;
-
-	while (reg != mask) {
-		reg = readl(lradc->base + LRADC_CTRL1) & mask;
-		dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
-	}
-
-	m1 = mxs_lradc_read_raw_channel(lradc, ch1);
-	m2 = mxs_lradc_read_raw_channel(lradc, ch2);
-
-	if (m2 == 0) {
-		dev_warn(lradc->dev, "Cannot calculate pressure\n");
-		return 1 << (LRADC_RESOLUTION - 1);
-	}
-
-	/* simply scale the value from 0 ... max ADC resolution */
-	pressure = m1;
-	pressure *= (1 << LRADC_RESOLUTION);
-	pressure /= m2;
-
-	dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
-	return pressure;
-}
-
-#define TS_CH_XP 2
-#define TS_CH_YP 3
-#define TS_CH_XM 4
-#define TS_CH_YM 5
-
-/*
- * YP(open)--+-------------+
- *           |             |--+
- *           |             |  |
- *    YM(-)--+-------------+  |
- *             +--------------+
- *             |              |
- *         XP(weak+)        XM(open)
- *
- * "weak+" means 200k Ohm VDDIO
- * (-) means GND
- */
-static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
-{
-	/*
-	 * In order to detect a touch event the 'touch detect enable' bit
-	 * enables:
-	 *  - a weak pullup to the X+ connector
-	 *  - a strong ground at the Y- connector
-	 */
-	mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
-	mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
-			  LRADC_CTRL0);
-}
-
-/*
- * YP(meas)--+-------------+
- *           |             |--+
- *           |             |  |
- * YM(open)--+-------------+  |
- *             +--------------+
- *             |              |
- *           XP(+)          XM(-)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
-{
-	mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
-	mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
-
-	lradc->cur_plate = LRADC_SAMPLE_X;
-	mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
-	mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
-}
-
-/*
- *   YP(+)--+-------------+
- *          |             |--+
- *          |             |  |
- *   YM(-)--+-------------+  |
- *            +--------------+
- *            |              |
- *         XP(open)        XM(meas)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
-{
-	mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
-	mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
-
-	lradc->cur_plate = LRADC_SAMPLE_Y;
-	mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
-	mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
-}
-
-/*
- *    YP(+)--+-------------+
- *           |             |--+
- *           |             |  |
- * YM(meas)--+-------------+  |
- *             +--------------+
- *             |              |
- *          XP(meas)        XM(-)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
-{
-	mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
-	mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
-
-	lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
-	mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
-	mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
-	mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
-				    TOUCHSCREEN_VCHANNEL1);
-}
-
-static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
-{
-	mxs_lradc_setup_touch_detection(lradc);
-
-	lradc->cur_plate = LRADC_TOUCH;
-	mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
-			    LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
-	mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
-}
-
-static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
-{
-	mxs_lradc_reg_clear(lradc,
-			    LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
-			    LRADC_CTRL1);
-	mxs_lradc_reg_set(lradc,
-			  LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
-			  LRADC_CTRL1);
-	/*
-	 * start with the Y-pos, because it uses nearly the same plate
-	 * settings like the touch detection
-	 */
-	mxs_lradc_prepare_y_pos(lradc);
-}
-
-static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
-{
-	input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
-	input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
-	input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
-	input_report_key(lradc->ts_input, BTN_TOUCH, 1);
-	input_sync(lradc->ts_input);
-}
-
-static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
-{
-	mxs_lradc_setup_touch_detection(lradc);
-	lradc->cur_plate = LRADC_SAMPLE_VALID;
-	/*
-	 * start a dummy conversion to burn time to settle the signals
-	 * note: we are not interested in the conversion's value
-	 */
-	mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
-	mxs_lradc_reg_clear(lradc,
-			    LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
-			    LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
-			    LRADC_CTRL1);
-	mxs_lradc_reg_wrt(
-		    lradc,
-		    LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
-		    LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
-		    LRADC_DELAY(2));
-}
-
-/*
- * in order to avoid false measurements, report only samples where
- * the surface is still touched after the position measurement
- */
-static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
-{
-	/* if it is still touched, report the sample */
-	if (valid && mxs_lradc_check_touch_event(lradc)) {
-		lradc->ts_valid = true;
-		mxs_lradc_report_ts_event(lradc);
-	}
-
-	/* if it is even still touched, continue with the next measurement */
-	if (mxs_lradc_check_touch_event(lradc)) {
-		mxs_lradc_prepare_y_pos(lradc);
-		return;
-	}
-
-	if (lradc->ts_valid) {
-		/* signal the release */
-		lradc->ts_valid = false;
-		input_report_key(lradc->ts_input, BTN_TOUCH, 0);
-		input_sync(lradc->ts_input);
-	}
-
-	/* if it is released, wait for the next touch via IRQ */
-	lradc->cur_plate = LRADC_TOUCH;
-	mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
-	mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
-	mxs_lradc_reg_clear(lradc,
-			    LRADC_CTRL1_TOUCH_DETECT_IRQ |
-			    LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
-			    LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
-			    LRADC_CTRL1);
-	mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
-}
-
-/* touchscreen's state machine */
-static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
-{
-	switch (lradc->cur_plate) {
-	case LRADC_TOUCH:
-		if (mxs_lradc_check_touch_event(lradc))
-			mxs_lradc_start_touch_event(lradc);
-		mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
-				    LRADC_CTRL1);
-		return;
-
-	case LRADC_SAMPLE_Y:
-		lradc->ts_y_pos =
-		    mxs_lradc_read_raw_channel(lradc,
-					       TOUCHSCREEN_VCHANNEL1);
-		mxs_lradc_prepare_x_pos(lradc);
-		return;
-
-	case LRADC_SAMPLE_X:
-		lradc->ts_x_pos =
-		    mxs_lradc_read_raw_channel(lradc,
-					       TOUCHSCREEN_VCHANNEL1);
-		mxs_lradc_prepare_pressure(lradc);
-		return;
-
-	case LRADC_SAMPLE_PRESSURE:
-		lradc->ts_pressure =
-		    mxs_lradc_read_ts_pressure(lradc,
-					       TOUCHSCREEN_VCHANNEL2,
-					       TOUCHSCREEN_VCHANNEL1);
-		mxs_lradc_complete_touch_event(lradc);
-		return;
-
-	case LRADC_SAMPLE_VALID:
-		mxs_lradc_finish_touch_event(lradc, 1);
-		break;
-	}
-}
-
-/*
- * Raw I/O operations
- */
-static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
-{
-	struct mxs_lradc *lradc = iio_priv(iio_dev);
-	int ret;
-
-	/*
-	 * See if there is no buffered operation in progress. If there is, simply
-	 * bail out. This can be improved to support both buffered and raw IO at
-	 * the same time, yet the code becomes horribly complicated. Therefore I
-	 * applied KISS principle here.
-	 */
-	ret = mutex_trylock(&lradc->lock);
-	if (!ret)
-		return -EBUSY;
-
-	reinit_completion(&lradc->completion);
-
-	/*
-	 * No buffered operation in progress, map the channel and trigger it.
-	 * Virtual channel 0 is always used here as the others are always not
-	 * used if doing raw sampling.
-	 */
-	if (lradc->soc == IMX28_LRADC)
-		mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
-				    LRADC_CTRL1);
-	mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
-
-	/* Enable / disable the divider per requirement */
-	if (test_bit(chan, &lradc->is_divided))
-		mxs_lradc_reg_set(lradc,
-				  1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
-				  LRADC_CTRL2);
-	else
-		mxs_lradc_reg_clear(lradc,
-				    1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
-				    LRADC_CTRL2);
-
-	/* Clean the slot's previous content, then set new one. */
-	mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
-			    LRADC_CTRL4);
-	mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
-
-	mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
-
-	/* Enable the IRQ and start sampling the channel. */
-	mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
-	mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
-
-	/* Wait for completion on the channel, 1 second max. */
-	ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
-	if (!ret)
-		ret = -ETIMEDOUT;
-	if (ret < 0)
-		goto err;
-
-	/* Read the data. */
-	*val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
-	ret = IIO_VAL_INT;
-
-err:
-	mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
-
-	mutex_unlock(&lradc->lock);
-
-	return ret;
-}
-
-static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
-{
-	int ret, min, max;
-
-	ret = mxs_lradc_read_single(iio_dev, 8, &min);
-	if (ret != IIO_VAL_INT)
-		return ret;
-
-	ret = mxs_lradc_read_single(iio_dev, 9, &max);
-	if (ret != IIO_VAL_INT)
-		return ret;
-
-	*val = max - min;
-
-	return IIO_VAL_INT;
-}
-
-static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
-			      const struct iio_chan_spec *chan,
-			      int *val, int *val2, long m)
-{
-	struct mxs_lradc *lradc = iio_priv(iio_dev);
-
-	switch (m) {
-	case IIO_CHAN_INFO_RAW:
-		if (chan->type == IIO_TEMP)
-			return mxs_lradc_read_temp(iio_dev, val);
-
-		return mxs_lradc_read_single(iio_dev, chan->channel, val);
-
-	case IIO_CHAN_INFO_SCALE:
-		if (chan->type == IIO_TEMP) {
-			/* From the datasheet, we have to multiply by 1.012 and
-			 * divide by 4
-			 */
-			*val = 0;
-			*val2 = 253000;
-			return IIO_VAL_INT_PLUS_MICRO;
-		}
-
-		*val = lradc->vref_mv[chan->channel];
-		*val2 = chan->scan_type.realbits -
-			test_bit(chan->channel, &lradc->is_divided);
-		return IIO_VAL_FRACTIONAL_LOG2;
-
-	case IIO_CHAN_INFO_OFFSET:
-		if (chan->type == IIO_TEMP) {
-			/* The calculated value from the ADC is in Kelvin, we
-			 * want Celsius for hwmon so the offset is -273.15
-			 * The offset is applied before scaling so it is
-			 * actually -213.15 * 4 / 1.012 = -1079.644268
-			 */
-			*val = -1079;
-			*val2 = 644268;
-
-			return IIO_VAL_INT_PLUS_MICRO;
-		}
-
-		return -EINVAL;
-
-	default:
-		break;
-	}
-
-	return -EINVAL;
-}
-
-static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
-			       const struct iio_chan_spec *chan,
-			       int val, int val2, long m)
-{
-	struct mxs_lradc *lradc = iio_priv(iio_dev);
-	struct mxs_lradc_scale *scale_avail =
-			lradc->scale_avail[chan->channel];
-	int ret;
-
-	ret = mutex_trylock(&lradc->lock);
-	if (!ret)
-		return -EBUSY;
-
-	switch (m) {
-	case IIO_CHAN_INFO_SCALE:
-		ret = -EINVAL;
-		if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
-		    val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
-			/* divider by two disabled */
-			clear_bit(chan->channel, &lradc->is_divided);
-			ret = 0;
-		} else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
-			   val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
-			/* divider by two enabled */
-			set_bit(chan->channel, &lradc->is_divided);
-			ret = 0;
-		}
-
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	mutex_unlock(&lradc->lock);
-
-	return ret;
-}
-
-static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
-				       const struct iio_chan_spec *chan,
-				       long m)
-{
-	return IIO_VAL_INT_PLUS_NANO;
-}
-
-static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
-						 struct device_attribute *attr,
-						 char *buf,
-						 int ch)
-{
-	struct iio_dev *iio = dev_to_iio_dev(dev);
-	struct mxs_lradc *lradc = iio_priv(iio);
-	int i, len = 0;
-
-	for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
-		len += sprintf(buf + len, "%u.%09u ",
-			       lradc->scale_avail[ch][i].integer,
-			       lradc->scale_avail[ch][i].nano);
-
-	len += sprintf(buf + len, "\n");
-
-	return len;
-}
-
-static ssize_t mxs_lradc_show_scale_available(struct device *dev,
-					      struct device_attribute *attr,
-					      char *buf)
-{
-	struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
-
-	return mxs_lradc_show_scale_available_ch(dev, attr, buf,
-						 iio_attr->address);
-}
-
-#define SHOW_SCALE_AVAILABLE_ATTR(ch)					\
-static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO,	\
-		       mxs_lradc_show_scale_available, NULL, ch)
-
-SHOW_SCALE_AVAILABLE_ATTR(0);
-SHOW_SCALE_AVAILABLE_ATTR(1);
-SHOW_SCALE_AVAILABLE_ATTR(2);
-SHOW_SCALE_AVAILABLE_ATTR(3);
-SHOW_SCALE_AVAILABLE_ATTR(4);
-SHOW_SCALE_AVAILABLE_ATTR(5);
-SHOW_SCALE_AVAILABLE_ATTR(6);
-SHOW_SCALE_AVAILABLE_ATTR(7);
-SHOW_SCALE_AVAILABLE_ATTR(10);
-SHOW_SCALE_AVAILABLE_ATTR(11);
-SHOW_SCALE_AVAILABLE_ATTR(12);
-SHOW_SCALE_AVAILABLE_ATTR(13);
-SHOW_SCALE_AVAILABLE_ATTR(14);
-SHOW_SCALE_AVAILABLE_ATTR(15);
-
-static struct attribute *mxs_lradc_attributes[] = {
-	&iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
-	&iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
-	NULL
-};
-
-static const struct attribute_group mxs_lradc_attribute_group = {
-	.attrs = mxs_lradc_attributes,
-};
-
-static const struct iio_info mxs_lradc_iio_info = {
-	.driver_module		= THIS_MODULE,
-	.read_raw		= mxs_lradc_read_raw,
-	.write_raw		= mxs_lradc_write_raw,
-	.write_raw_get_fmt	= mxs_lradc_write_raw_get_fmt,
-	.attrs			= &mxs_lradc_attribute_group,
-};
-
-static int mxs_lradc_ts_open(struct input_dev *dev)
-{
-	struct mxs_lradc *lradc = input_get_drvdata(dev);
-
-	/* Enable the touch-detect circuitry. */
-	mxs_lradc_enable_touch_detection(lradc);
-
-	return 0;
-}
-
-static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
-{
-	/* stop all interrupts from firing */
-	mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
-		LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |