Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 836 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c
new file mode 100644
index 000000000..5cfe477ec
--- /dev/null
+++ b/drivers/input/touchscreen/ad7877.c
@@ -0,0 +1,836 @@
+/*
+ * Copyright (C) 2006-2008 Michael Hennerich, Analog Devices Inc.
+ *
+ * Description:	AD7877 based touchscreen, sensor (ADCs), DAC and GPIO driver
+ * Based on:	ads7846.c
+ *
+ * Bugs:        Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * History:
+ * Copyright (c) 2005 David Brownell
+ * Copyright (c) 2006 Nokia Corporation
+ * Various changes: Imre Deak <imre.deak@nokia.com>
+ *
+ * Using code from:
+ *  - corgi_ts.c
+ *	Copyright (C) 2004-2005 Richard Purdie
+ *  - omap_ts.[hc], ads7846.h, ts_osk.c
+ *	Copyright (C) 2002 MontaVista Software
+ *	Copyright (C) 2004 Texas Instruments
+ *	Copyright (C) 2005 Dirk Behme
+ */
+
+
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/ad7877.h>
+#include <linux/module.h>
+#include <asm/irq.h>
+
+#define	TS_PEN_UP_TIMEOUT	msecs_to_jiffies(100)
+
+#define MAX_SPI_FREQ_HZ			20000000
+#define	MAX_12BIT			((1<<12)-1)
+
+#define AD7877_REG_ZEROS			0
+#define AD7877_REG_CTRL1			1
+#define AD7877_REG_CTRL2			2
+#define AD7877_REG_ALERT			3
+#define AD7877_REG_AUX1HIGH			4
+#define AD7877_REG_AUX1LOW			5
+#define AD7877_REG_BAT1HIGH			6
+#define AD7877_REG_BAT1LOW			7
+#define AD7877_REG_BAT2HIGH			8
+#define AD7877_REG_BAT2LOW			9
+#define AD7877_REG_TEMP1HIGH			10
+#define AD7877_REG_TEMP1LOW			11
+#define AD7877_REG_SEQ0				12
+#define AD7877_REG_SEQ1				13
+#define AD7877_REG_DAC				14
+#define AD7877_REG_NONE1			15
+#define AD7877_REG_EXTWRITE			15
+#define AD7877_REG_XPLUS			16
+#define AD7877_REG_YPLUS			17
+#define AD7877_REG_Z2				18
+#define AD7877_REG_aux1				19
+#define AD7877_REG_aux2				20
+#define AD7877_REG_aux3				21
+#define AD7877_REG_bat1				22
+#define AD7877_REG_bat2				23
+#define AD7877_REG_temp1			24
+#define AD7877_REG_temp2			25
+#define AD7877_REG_Z1				26
+#define AD7877_REG_GPIOCTRL1			27
+#define AD7877_REG_GPIOCTRL2			28
+#define AD7877_REG_GPIODATA			29
+#define AD7877_REG_NONE2			30
+#define AD7877_REG_NONE3			31
+
+#define AD7877_SEQ_YPLUS_BIT			(1<<11)
+#define AD7877_SEQ_XPLUS_BIT			(1<<10)
+#define AD7877_SEQ_Z2_BIT			(1<<9)
+#define AD7877_SEQ_AUX1_BIT			(1<<8)
+#define AD7877_SEQ_AUX2_BIT			(1<<7)
+#define AD7877_SEQ_AUX3_BIT			(1<<6)
+#define AD7877_SEQ_BAT1_BIT			(1<<5)
+#define AD7877_SEQ_BAT2_BIT			(1<<4)
+#define AD7877_SEQ_TEMP1_BIT			(1<<3)
+#define AD7877_SEQ_TEMP2_BIT			(1<<2)
+#define AD7877_SEQ_Z1_BIT			(1<<1)
+
+enum {
+	AD7877_SEQ_YPOS  = 0,
+	AD7877_SEQ_XPOS  = 1,
+	AD7877_SEQ_Z2    = 2,
+	AD7877_SEQ_AUX1  = 3,
+	AD7877_SEQ_AUX2  = 4,
+	AD7877_SEQ_AUX3  = 5,
+	AD7877_SEQ_BAT1  = 6,
+	AD7877_SEQ_BAT2  = 7,
+	AD7877_SEQ_TEMP1 = 8,
+	AD7877_SEQ_TEMP2 = 9,
+	AD7877_SEQ_Z1    = 10,
+	AD7877_NR_SENSE  = 11,
+};
+
+/* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */
+#define AD7877_DAC_CONF			0x1
+
+/* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */
+#define AD7877_EXTW_GPIO_3_CONF		0x1C4
+#define AD7877_EXTW_GPIO_DATA		0x200
+
+/* Control REG 2 */
+#define AD7877_TMR(x)			((x & 0x3) << 0)
+#define AD7877_REF(x)			((x & 0x1) << 2)
+#define AD7877_POL(x)			((x & 0x1) << 3)
+#define AD7877_FCD(x)			((x & 0x3) << 4)
+#define AD7877_PM(x)			((x & 0x3) << 6)
+#define AD7877_ACQ(x)			((x & 0x3) << 8)
+#define AD7877_AVG(x)			((x & 0x3) << 10)
+
+/* Control REG 1 */
+#define	AD7877_SER			(1 << 11)	/* non-differential */
+#define	AD7877_DFR			(0 << 11)	/* differential */
+
+#define AD7877_MODE_NOC  (0)	/* Do not convert */
+#define AD7877_MODE_SCC  (1)	/* Single channel conversion */
+#define AD7877_MODE_SEQ0 (2)	/* Sequence 0 in Slave Mode */
+#define AD7877_MODE_SEQ1 (3)	/* Sequence 1 in Master Mode */
+
+#define AD7877_CHANADD(x)		((x&0xF)<<7)
+#define AD7877_READADD(x)		((x)<<2)
+#define AD7877_WRITEADD(x)		((x)<<12)
+
+#define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \
+		AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \
+		AD7877_READADD(AD7877_REG_ ## x))
+
+#define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \
+		AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT)
+
+/*
+ * Non-touchscreen sensors only use single-ended conversions.
+ */
+
+struct ser_req {
+	u16			reset;
+	u16			ref_on;
+	u16			command;
+	struct spi_message	msg;
+	struct spi_transfer	xfer[6];
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	u16 sample ____cacheline_aligned;
+};
+
+struct ad7877 {
+	struct input_dev	*input;
+	char			phys[32];
+
+	struct spi_device	*spi;
+	u16			model;
+	u16			vref_delay_usecs;
+	u16			x_plate_ohms;
+	u16			pressure_max;
+
+	u16			cmd_crtl1;
+	u16			cmd_crtl2;
+	u16			cmd_dummy;
+	u16			dac;
+
+	u8			stopacq_polarity;
+	u8			first_conversion_delay;
+	u8			acquisition_time;
+	u8			averaging;
+	u8			pen_down_acc_interval;
+
+	struct spi_transfer	xfer[AD7877_NR_SENSE + 2];
+	struct spi_message	msg;
+
+	struct mutex		mutex;
+	bool			disabled;	/* P: mutex */
+	bool			gpio3;		/* P: mutex */
+	bool			gpio4;		/* P: mutex */
+
+	spinlock_t		lock;
+	struct timer_list	timer;		/* P: lock */
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned;
+};
+
+static bool gpio3;
+module_param(gpio3, bool, 0);
+MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3");
+
+static int ad7877_read(struct spi_device *spi, u16 reg)
+{
+	struct ser_req *req;
+	int status, ret;
+
+	req = kzalloc(sizeof *req, GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	spi_message_init(&req->msg);
+
+	req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) |
+			AD7877_READADD(reg));
+	req->xfer[0].tx_buf = &req->command;
+	req->xfer[0].len = 2;
+	req->xfer[0].cs_change = 1;
+
+	req->xfer[1].rx_buf = &req->sample;
+	req->xfer[1].len = 2;
+
+	spi_message_add_tail(&req->xfer[0], &req->msg);
+	spi_message_add_tail(&req->xfer[1], &req->msg);
+
+	status = spi_sync(spi, &req->msg);
+	ret = status ? : req->sample;
+
+	kfree(req);
+
+	return ret;
+}
+
+static int ad7877_write(struct spi_device *spi, u16 reg, u16 val)
+{
+	struct ser_req *req;
+	int status;
+
+	req = kzalloc(sizeof *req, GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	spi_message_init(&req->msg);
+
+	req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT));
+	req->xfer[0].tx_buf = &req->command;
+	req->xfer[0].len = 2;
+
+	spi_message_add_tail(&req->xfer[0], &req->msg);
+
+	status = spi_sync(spi, &req->msg);
+
+	kfree(req);
+
+	return status;
+}
+
+static int ad7877_read_adc(struct spi_device *spi, unsigned command)
+{
+	struct ad7877 *ts = spi_get_drvdata(spi);
+	struct ser_req *req;
+	int status;
+	int sample;
+	int i;
+
+	req = kzalloc(sizeof *req, GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	spi_message_init(&req->msg);
+
+	/* activate reference, so it has time to settle; */
+	req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) |
+			 AD7877_POL(ts->stopacq_polarity) |
+			 AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) |
+			 AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0);
+
+	req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC;
+
+	req->command = (u16) command;
+
+	req->xfer[0].tx_buf = &req->reset;
+	req->xfer[0].len = 2;
+	req->xfer[0].cs_change = 1;
+
+	req->xfer[1].tx_buf = &req->ref_on;
+	req->xfer[1].len = 2;
+	req->xfer[1].delay_usecs = ts->vref_delay_usecs;
+	req->xfer[1].cs_change = 1;
+
+	req->xfer[2].tx_buf = &req->command;
+	req->xfer[2].len = 2;
+	req->xfer[2].delay_usecs = ts->vref_delay_usecs;
+	req->xfer[2].cs_change = 1;
+
+	req->xfer[3].rx_buf = &req->sample;
+	req->xfer[3].len = 2;
+	req->xfer[3].cs_change = 1;
+
+	req->xfer[4].tx_buf = &ts->cmd_crtl2;	/*REF OFF*/
+	req->xfer[4].len = 2;
+	req->xfer[4].cs_change = 1;
+
+	req->xfer[5].tx_buf = &ts->cmd_crtl1;	/*DEFAULT*/
+	req->xfer[5].len = 2;
+
+	/* group all the transfers together, so we can't interfere with
+	 * reading touchscreen state; disable penirq while sampling
+	 */
+	for (i = 0; i < 6; i++)
+		spi_message_add_tail(&req->xfer[i], &req->msg);
+
+	status = spi_sync(spi, &req->msg);
+	sample = req->sample;
+
+	kfree(req);
+
+	return status ? : sample;
+}
+
+static int ad7877_process_data(struct ad7877 *ts)
+{
+	struct input_dev *input_dev = ts->input;
+	unsigned Rt;
+	u16 x, y, z1, z2;
+
+	x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT;
+	y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT;
+	z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT;
+	z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT;
+
+	/*
+	 * The samples processed here are already preprocessed by the AD7877.
+	 * The preprocessing function consists of an averaging filter.
+	 * The combination of 'first conversion delay' and averaging provides a robust solution,
+	 * discarding the spurious noise in the signal and keeping only the data of interest.
+	 * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h)
+	 * Other user-programmable conversion controls include variable acquisition time,
+	 * and first conversion delay. Up to 16 averages can be taken per conversion.
+	 */
+
+	if (likely(x && z1)) {
+		/* compute touch pressure resistance using equation #1 */
+		Rt = (z2 - z1) * x * ts->x_plate_ohms;
+		Rt /= z1;
+		Rt = (Rt + 2047) >> 12;
+
+		/*
+		 * Sample found inconsistent, pressure is beyond
+		 * the maximum. Don't report it to user space.
+		 */
+		if (Rt > ts->pressure_max)
+			return -EINVAL;
+
+		if (!timer_pending(&ts->timer))
+			input_report_key(input_dev, BTN_TOUCH, 1);
+
+		input_report_abs(input_dev, ABS_X, x);
+		input_report_abs(input_dev, ABS_Y, y);
+		input_report_abs(input_dev, ABS_PRESSURE, Rt);
+		input_sync(input_dev);
+
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static inline void ad7877_ts_event_release(struct ad7877 *ts)
+{
+	struct input_dev *input_dev = ts->input;
+
+	input_report_abs(input_dev, ABS_PRESSURE, 0);
+	input_report_key(input_dev, BTN_TOUCH, 0);
+	input_sync(input_dev);
+}
+
+static void ad7877_timer(struct timer_list *t)
+{
+	struct ad7877 *ts = from_timer(ts, t, timer);
+	unsigned long flags;
+
+	spin_lock_irqsave(&ts->lock, flags);
+	ad7877_ts_event_release(ts);
+	spin_unlock_irqrestore(&ts->lock, flags);
+}
+
+static irqreturn_t ad7877_irq(int irq, void *handle)
+{
+	struct ad7877 *ts = handle;
+	unsigned long flags;
+	int error;
+
+	error = spi_sync(ts->spi, &ts->msg);
+	if (error) {
+		dev_err(&ts->spi->dev, "spi_sync --> %d\n", error);
+		goto out;
+	}
+
+	spin_lock_irqsave(&ts->lock, flags);
+	error = ad7877_process_data(ts);
+	if (!error)
+		mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
+	spin_unlock_irqrestore(&ts->lock, flags);
+
+out:
+	return IRQ_HANDLED;
+}
+
+static void ad7877_disable(void *data)
+{
+	struct ad7877 *ts = data;
+
+	mutex_lock(&ts->mutex);
+
+	if (!ts->disabled) {
+		ts->disabled = true;
+		disable_irq(ts->spi->irq);
+
+		if (del_timer_sync(&ts->timer))
+			ad7877_ts_event_release(ts);
+	}
+
+	/*
+	 * We know the chip's in lowpower mode since we always
+	 * leave it that way after every request
+	 */
+
+	mutex_unlock(&ts->mutex);
+}
+
+static void ad7877_enable(struct ad7877 *ts)
+{
+	mutex_lock(&ts->mutex);
+
+	if (ts->disabled) {
+		ts->disabled = false;
+		enable_irq(ts->spi->irq);
+	}
+
+	mutex_unlock(&ts->mutex);
+}
+
+#define SHOW(name) static ssize_t \
+name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+	struct ad7877 *ts = dev_get_drvdata(dev); \
+	ssize_t v = ad7877_read_adc(ts->spi, \
+			AD7877_READ_CHAN(name)); \
+	if (v < 0) \
+		return v; \
+	return sprintf(buf, "%u\n", (unsigned) v); \
+} \
+static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL);
+
+SHOW(aux1)
+SHOW(aux2)
+SHOW(aux3)
+SHOW(bat1)
+SHOW(bat2)
+SHOW(temp1)
+SHOW(temp2)
+
+static ssize_t ad7877_disable_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ts->disabled);
+}
+
+static ssize_t ad7877_disable_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+	unsigned int val;
+	int error;
+
+	error = kstrtouint(buf, 10, &val);
+	if (error)
+		return error;
+
+	if (val)
+		ad7877_disable(ts);
+	else
+		ad7877_enable(ts);
+
+	return count;
+}
+
+static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store);
+
+static ssize_t ad7877_dac_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ts->dac);
+}
+
+static ssize_t ad7877_dac_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+	unsigned int val;
+	int error;
+
+	error = kstrtouint(buf, 10, &val);
+	if (error)
+		return error;
+
+	mutex_lock(&ts->mutex);
+	ts->dac = val & 0xFF;
+	ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF);
+	mutex_unlock(&ts->mutex);
+
+	return count;
+}
+
+static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store);
+
+static ssize_t ad7877_gpio3_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ts->gpio3);
+}
+
+static ssize_t ad7877_gpio3_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+	unsigned int val;
+	int error;
+
+	error = kstrtouint(buf, 10, &val);
+	if (error)
+		return error;
+
+	mutex_lock(&ts->mutex);
+	ts->gpio3 = !!val;
+	ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
+		 (ts->gpio4 << 4) | (ts->gpio3 << 5));
+	mutex_unlock(&ts->mutex);
+
+	return count;
+}
+
+static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store);
+
+static ssize_t ad7877_gpio4_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ts->gpio4);
+}
+
+static ssize_t ad7877_gpio4_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+	unsigned int val;
+	int error;
+
+	error = kstrtouint(buf, 10, &val);
+	if (error)
+		return error;
+
+	mutex_lock(&ts->mutex);
+	ts->gpio4 = !!val;
+	ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
+		     (ts->gpio4 << 4) | (ts->gpio3 << 5));
+	mutex_unlock(&ts->mutex);
+
+	return count;
+}
+
+static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store);
+
+static struct attribute *ad7877_attributes[] = {
+	&dev_attr_temp1.attr,
+	&dev_attr_temp2.attr,
+	&dev_attr_aux1.attr,
+	&dev_attr_aux2.attr,
+	&dev_attr_aux3.attr,
+	&dev_attr_bat1.attr,
+	&dev_attr_bat2.attr,
+	&dev_attr_disable.attr,
+	&dev_attr_dac.attr,
+	&dev_attr_gpio3.attr,
+	&dev_attr_gpio4.attr,
+	NULL
+};
+
+static umode_t ad7877_attr_is_visible(struct kobject *kobj,
+				     struct attribute *attr, int n)
+{
+	umode_t mode = attr->mode;
+
+	if (attr == &dev_attr_aux3.attr) {
+		if (gpio3)
+			mode = 0;
+	} else if (attr == &dev_attr_gpio3.attr) {
+		if (!gpio3)
+			mode = 0;
+	}
+
+	return mode;
+}
+
+static const struct attribute_group ad7877_attr_group = {
+	.is_visible	= ad7877_attr_is_visible,
+	.attrs		= ad7877_attributes,
+};
+
+static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts)
+{
+	struct spi_message *m;
+	int i;
+
+	ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) |
+			AD7877_POL(ts->stopacq_polarity) |
+			AD7877_AVG(ts->averaging) | AD7877_PM(1) |
+			AD7877_TMR(ts->pen_down_acc_interval) |
+			AD7877_ACQ(ts->acquisition_time) |
+			AD7877_FCD(ts->first_conversion_delay);
+
+	ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2);
+
+	ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) |
+			AD7877_READADD(AD7877_REG_XPLUS-1) |
+			AD7877_MODE_SEQ1 | AD7877_DFR;
+
+	ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1);
+
+	ts->cmd_dummy = 0;
+
+	m = &ts->msg;
+
+	spi_message_init(m);
+
+	m->context = ts;
+
+	ts->xfer[0].tx_buf = &ts->cmd_crtl1;
+	ts->xfer[0].len = 2;
+	ts->xfer[0].cs_change = 1;
+
+	spi_message_add_tail(&ts->xfer[0], m);
+
+	ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */
+	ts->xfer[1].len = 2;
+	ts->xfer[1].cs_change = 1;
+
+	spi_message_add_tail(&ts->xfer[1], m);
+
+	for (i = 0; i < AD7877_NR_SENSE; i++) {
+		ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i];
+		ts->xfer[i + 2].len = 2;
+		if (i < (AD7877_NR_SENSE - 1))
+			ts->xfer[i + 2].cs_change = 1;
+		spi_message_add_tail(&ts->xfer[i + 2], m);
+	}
+}
+
+static int ad7877_probe(struct spi_device *spi)
+{
+	struct ad7877			*ts;
+	struct input_dev		*input_dev;
+	struct ad7877_platform_data	*pdata = dev_get_platdata(&spi->dev);
+	int				err;
+	u16				verify;
+
+	if (!spi->irq) {
+		dev_dbg(&spi->dev, "no IRQ?\n");
+		return -ENODEV;
+	}
+
+	if (!pdata) {
+		dev_dbg(&spi->dev, "no platform data?\n");
+		return -ENODEV;
+	}
+
+	/* don't exceed max specified SPI CLK frequency */
+	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
+		dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz);
+		return -EINVAL;
+	}
+
+	spi->bits_per_word = 16;
+	err = spi_setup(spi);
+	if (err) {
+		dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");
+		return err;
+	}
+
+	ts = devm_kzalloc(&spi->dev, sizeof(struct ad7877), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	input_dev = devm_input_allocate_device(&spi->dev);
+	if (!input_dev)
+		return -ENOMEM;
+
+	err = devm_add_action_or_reset(&spi->dev, ad7877_disable, ts);
+	if (err)
+		return err;
+
+	spi_set_drvdata(spi, ts);
+	ts->spi = spi;
+	ts->input = input_dev;
+
+	timer_setup(&ts->timer, ad7877_timer, 0);
+	mutex_init(&ts->mutex);
+	spin_lock_init(&ts->lock);
+
+	ts->model = pdata->model ? : 7877;
+	ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
+	ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
+	ts->pressure_max = pdata->pressure_max ? : ~0;
+
+	ts->stopacq_polarity = pdata->stopacq_polarity;
+	ts->first_conversion_delay = pdata->first_conversion_delay;
+	ts->acquisition_time = pdata->acquisition_time;
+	ts->averaging = pdata->averaging;
+	ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
+
+	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
+
+	input_dev->name = "AD7877 Touchscreen";
+	input_dev->phys = ts->phys;
+	input_dev->dev.parent = &spi->dev;
+
+	__set_bit(EV_KEY, input_dev->evbit);
+	__set_bit(BTN_TOUCH, input_dev->keybit);
+	__set_bit(EV_ABS, input_dev->evbit);
+	__set_bit(ABS_X, input_dev->absbit);
+	__set_bit(ABS_Y, input_dev->absbit);
+	__set_bit(ABS_PRESSURE, input_dev->absbit);
+
+	input_set_abs_params(input_dev, ABS_X,
+			pdata->x_min ? : 0,
+			pdata->x_max ? : MAX_12BIT,
+			0, 0);
+	input_set_abs_params(input_dev, ABS_Y,
+			pdata->y_min ? : 0,
+			pdata->y_max ? : MAX_12BIT,
+			0, 0);
+	input_set_abs_params(input_dev, ABS_PRESSURE,
+			pdata->pressure_min, pdata->pressure_max, 0, 0);
+
+	ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE);
+
+	verify = ad7877_read(spi, AD7877_REG_SEQ1);
+
+	if (verify != AD7877_MM_SEQUENCE) {
+		dev_err(&spi->dev, "%s: Failed to probe %s\n",
+			dev_name(&spi->dev), input_dev->name);
+		return -ENODEV;
+	}
+
+	if (gpio3)
+		ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF);
+
+	ad7877_setup_ts_def_msg(spi, ts);
+
+	/* Request AD7877 /DAV GPIO interrupt */
+
+	err = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, ad7877_irq,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					spi->dev.driver->name, ts);
+	if (err) {
+		dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
+		return err;
+	}
+
+	err = devm_device_add_group(&spi->dev, &ad7877_attr_group);
+	if (err)
+		return err;
+
+	err = input_register_device(input_dev);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static int __maybe_unused ad7877_suspend(struct device *dev)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+
+	ad7877_disable(ts);
+
+	return 0;
+}
+
+static int __maybe_unused ad7877_resume(struct device *dev)
+{
+	struct ad7877 *ts = dev_get_drvdata(dev);
+
+	ad7877_enable(ts);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ad7877_pm, ad7877_suspend, ad7877_resume);
+
+static struct spi_driver ad7877_driver = {
+	.driver = {
+		.name	= "ad7877",
+		.pm	= &ad7877_pm,
+	},
+	.probe		= ad7877_probe,
+};
+
+module_spi_driver(ad7877_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("AD7877 touchscreen Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:ad7877");