Initial import

1 files changed, 647 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c
new file mode 100644
index 000000000..fec66ad80
--- /dev/null
+++ b/drivers/input/touchscreen/ad7879.c
@@ -0,0 +1,647 @@
+/*
+ * AD7879/AD7889 based touchscreen and GPIO driver
+ *
+ * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ *
+ * 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
+ *  - ad7877.c
+ *	Copyright (C) 2006-2008 Analog Devices Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+
+#include <linux/spi/ad7879.h>
+#include <linux/module.h>
+#include "ad7879.h"
+
+#define AD7879_REG_ZEROS		0
+#define AD7879_REG_CTRL1		1
+#define AD7879_REG_CTRL2		2
+#define AD7879_REG_CTRL3		3
+#define AD7879_REG_AUX1HIGH		4
+#define AD7879_REG_AUX1LOW		5
+#define AD7879_REG_TEMP1HIGH		6
+#define AD7879_REG_TEMP1LOW		7
+#define AD7879_REG_XPLUS		8
+#define AD7879_REG_YPLUS		9
+#define AD7879_REG_Z1			10
+#define AD7879_REG_Z2			11
+#define AD7879_REG_AUXVBAT		12
+#define AD7879_REG_TEMP			13
+#define AD7879_REG_REVID		14
+
+/* Control REG 1 */
+#define AD7879_TMR(x)			((x & 0xFF) << 0)
+#define AD7879_ACQ(x)			((x & 0x3) << 8)
+#define AD7879_MODE_NOC			(0 << 10)	/* Do not convert */
+#define AD7879_MODE_SCC			(1 << 10)	/* Single channel conversion */
+#define AD7879_MODE_SEQ0		(2 << 10)	/* Sequence 0 in Slave Mode */
+#define AD7879_MODE_SEQ1		(3 << 10)	/* Sequence 1 in Master Mode */
+#define AD7879_MODE_INT			(1 << 15)	/* PENIRQ disabled INT enabled */
+
+/* Control REG 2 */
+#define AD7879_FCD(x)			((x & 0x3) << 0)
+#define AD7879_RESET			(1 << 4)
+#define AD7879_MFS(x)			((x & 0x3) << 5)
+#define AD7879_AVG(x)			((x & 0x3) << 7)
+#define	AD7879_SER			(1 << 9)	/* non-differential */
+#define	AD7879_DFR			(0 << 9)	/* differential */
+#define AD7879_GPIOPOL			(1 << 10)
+#define AD7879_GPIODIR			(1 << 11)
+#define AD7879_GPIO_DATA		(1 << 12)
+#define AD7879_GPIO_EN			(1 << 13)
+#define AD7879_PM(x)			((x & 0x3) << 14)
+#define AD7879_PM_SHUTDOWN		(0)
+#define AD7879_PM_DYN			(1)
+#define AD7879_PM_FULLON		(2)
+
+/* Control REG 3 */
+#define AD7879_TEMPMASK_BIT		(1<<15)
+#define AD7879_AUXVBATMASK_BIT		(1<<14)
+#define AD7879_INTMODE_BIT		(1<<13)
+#define AD7879_GPIOALERTMASK_BIT	(1<<12)
+#define AD7879_AUXLOW_BIT		(1<<11)
+#define AD7879_AUXHIGH_BIT		(1<<10)
+#define AD7879_TEMPLOW_BIT		(1<<9)
+#define AD7879_TEMPHIGH_BIT		(1<<8)
+#define AD7879_YPLUS_BIT		(1<<7)
+#define AD7879_XPLUS_BIT		(1<<6)
+#define AD7879_Z1_BIT			(1<<5)
+#define AD7879_Z2_BIT			(1<<4)
+#define AD7879_AUX_BIT			(1<<3)
+#define AD7879_VBAT_BIT			(1<<2)
+#define AD7879_TEMP_BIT			(1<<1)
+
+enum {
+	AD7879_SEQ_XPOS  = 0,
+	AD7879_SEQ_YPOS  = 1,
+	AD7879_SEQ_Z1    = 2,
+	AD7879_SEQ_Z2    = 3,
+	AD7879_NR_SENSE  = 4,
+};
+
+#define	MAX_12BIT			((1<<12)-1)
+#define	TS_PEN_UP_TIMEOUT		msecs_to_jiffies(50)
+
+struct ad7879 {
+	const struct ad7879_bus_ops *bops;
+
+	struct device		*dev;
+	struct input_dev	*input;
+	struct timer_list	timer;
+#ifdef CONFIG_GPIOLIB
+	struct gpio_chip	gc;
+	struct mutex		mutex;
+#endif
+	unsigned int		irq;
+	bool			disabled;	/* P: input->mutex */
+	bool			suspended;	/* P: input->mutex */
+	bool			swap_xy;
+	u16			conversion_data[AD7879_NR_SENSE];
+	char			phys[32];
+	u8			first_conversion_delay;
+	u8			acquisition_time;
+	u8			averaging;
+	u8			pen_down_acc_interval;
+	u8			median;
+	u16			x_plate_ohms;
+	u16			pressure_max;
+	u16			cmd_crtl1;
+	u16			cmd_crtl2;
+	u16			cmd_crtl3;
+	int			x;
+	int			y;
+	int			Rt;
+};
+
+static int ad7879_read(struct ad7879 *ts, u8 reg)
+{
+	return ts->bops->read(ts->dev, reg);
+}
+
+static int ad7879_multi_read(struct ad7879 *ts, u8 first_reg, u8 count, u16 *buf)
+{
+	return ts->bops->multi_read(ts->dev, first_reg, count, buf);
+}
+
+static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
+{
+	return ts->bops->write(ts->dev, reg, val);
+}
+
+static int ad7879_report(struct ad7879 *ts)
+{
+	struct input_dev *input_dev = ts->input;
+	unsigned Rt;
+	u16 x, y, z1, z2;
+
+	x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
+	y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
+	z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
+	z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
+
+	if (ts->swap_xy)
+		swap(x, y);
+
+	/*
+	 * The samples processed here are already preprocessed by the AD7879.
+	 * The preprocessing function consists of a median and an averaging
+	 * filter.  The combination of these two techniques provides a robust
+	 * solution, discarding the spurious noise in the signal and keeping
+	 * only the data of interest.  The size of both filters is
+	 * programmable. (dev.platform_data, see linux/spi/ad7879.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;
+
+		/*
+		 * Note that we delay reporting events by one sample.
+		 * This is done to avoid reporting last sample of the
+		 * touch sequence, which may be incomplete if finger
+		 * leaves the surface before last reading is taken.
+		 */
+		if (timer_pending(&ts->timer)) {
+			/* Touch continues */
+			input_report_key(input_dev, BTN_TOUCH, 1);
+			input_report_abs(input_dev, ABS_X, ts->x);
+			input_report_abs(input_dev, ABS_Y, ts->y);
+			input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
+			input_sync(input_dev);
+		}
+
+		ts->x = x;
+		ts->y = y;
+		ts->Rt = Rt;
+
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void ad7879_ts_event_release(struct ad7879 *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 ad7879_timer(unsigned long handle)
+{
+	struct ad7879 *ts = (void *)handle;
+
+	ad7879_ts_event_release(ts);
+}
+
+static irqreturn_t ad7879_irq(int irq, void *handle)
+{
+	struct ad7879 *ts = handle;
+
+	ad7879_multi_read(ts, AD7879_REG_XPLUS, AD7879_NR_SENSE, ts->conversion_data);
+
+	if (!ad7879_report(ts))
+		mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
+
+	return IRQ_HANDLED;
+}
+
+static void __ad7879_enable(struct ad7879 *ts)
+{
+	ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
+	ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
+	ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
+
+	enable_irq(ts->irq);
+}
+
+static void __ad7879_disable(struct ad7879 *ts)
+{
+	u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) |
+		AD7879_PM(AD7879_PM_SHUTDOWN);
+	disable_irq(ts->irq);
+
+	if (del_timer_sync(&ts->timer))
+		ad7879_ts_event_release(ts);
+
+	ad7879_write(ts, AD7879_REG_CTRL2, reg);
+}
+
+
+static int ad7879_open(struct input_dev *input)
+{
+	struct ad7879 *ts = input_get_drvdata(input);
+
+	/* protected by input->mutex */
+	if (!ts->disabled && !ts->suspended)
+		__ad7879_enable(ts);
+
+	return 0;
+}
+
+static void ad7879_close(struct input_dev* input)
+{
+	struct ad7879 *ts = input_get_drvdata(input);
+
+	/* protected by input->mutex */
+	if (!ts->disabled && !ts->suspended)
+		__ad7879_disable(ts);
+}
+
+static int __maybe_unused ad7879_suspend(struct device *dev)
+{
+	struct ad7879 *ts = dev_get_drvdata(dev);
+
+	mutex_lock(&ts->input->mutex);
+
+	if (!ts->suspended && !ts->disabled && ts->input->users)
+		__ad7879_disable(ts);
+
+	ts->suspended = true;
+
+	mutex_unlock(&ts->input->mutex);
+
+	return 0;
+}
+
+static int __maybe_unused ad7879_resume(struct device *dev)
+{
+	struct ad7879 *ts = dev_get_drvdata(dev);
+
+	mutex_lock(&ts->input->mutex);
+
+	if (ts->suspended && !ts->disabled && ts->input->users)
+		__ad7879_enable(ts);
+
+	ts->suspended = false;
+
+	mutex_unlock(&ts->input->mutex);
+
+	return 0;
+}
+
+SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume);
+EXPORT_SYMBOL(ad7879_pm_ops);
+
+static void ad7879_toggle(struct ad7879 *ts, bool disable)
+{
+	mutex_lock(&ts->input->mutex);
+
+	if (!ts->suspended && ts->input->users != 0) {
+
+		if (disable) {
+			if (ts->disabled)
+				__ad7879_enable(ts);
+		} else {
+			if (!ts->disabled)
+				__ad7879_disable(ts);
+		}
+	}
+
+	ts->disabled = disable;
+
+	mutex_unlock(&ts->input->mutex);
+}
+
+static ssize_t ad7879_disable_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct ad7879 *ts = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", ts->disabled);
+}
+
+static ssize_t ad7879_disable_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct ad7879 *ts = dev_get_drvdata(dev);
+	unsigned int val;
+	int error;
+
+	error = kstrtouint(buf, 10, &val);
+	if (error)
+		return error;
+
+	ad7879_toggle(ts, val);
+
+	return count;
+}
+
+static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
+
+static struct attribute *ad7879_attributes[] = {
+	&dev_attr_disable.attr,
+	NULL
+};
+
+static const struct attribute_group ad7879_attr_group = {
+	.attrs = ad7879_attributes,
+};
+
+#ifdef CONFIG_GPIOLIB
+static int ad7879_gpio_direction_input(struct gpio_chip *chip,
+					unsigned gpio)
+{
+	struct ad7879 *ts = container_of(chip, struct ad7879, gc);
+	int err;
+
+	mutex_lock(&ts->mutex);
+	ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL;
+	err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
+	mutex_unlock(&ts->mutex);
+
+	return err;
+}
+
+static int ad7879_gpio_direction_output(struct gpio_chip *chip,
+					unsigned gpio, int level)
+{
+	struct ad7879 *ts = container_of(chip, struct ad7879, gc);
+	int err;
+
+	mutex_lock(&ts->mutex);
+	ts->cmd_crtl2 &= ~AD7879_GPIODIR;
+	ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL;
+	if (level)
+		ts->cmd_crtl2 |= AD7879_GPIO_DATA;
+	else
+		ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
+
+	err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
+	mutex_unlock(&ts->mutex);
+
+	return err;
+}
+
+static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+	struct ad7879 *ts = container_of(chip, struct ad7879, gc);
+	u16 val;
+
+	mutex_lock(&ts->mutex);
+	val = ad7879_read(ts, AD7879_REG_CTRL2);
+	mutex_unlock(&ts->mutex);
+
+	return !!(val & AD7879_GPIO_DATA);
+}
+
+static void ad7879_gpio_set_value(struct gpio_chip *chip,
+				  unsigned gpio, int value)
+{
+	struct ad7879 *ts = container_of(chip, struct ad7879, gc);
+
+	mutex_lock(&ts->mutex);
+	if (value)
+		ts->cmd_crtl2 |= AD7879_GPIO_DATA;
+	else
+		ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
+
+	ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
+	mutex_unlock(&ts->mutex);
+}
+
+static int ad7879_gpio_add(struct ad7879 *ts,
+			   const struct ad7879_platform_data *pdata)
+{
+	int ret = 0;
+
+	mutex_init(&ts->mutex);
+
+	if (pdata->gpio_export) {
+		ts->gc.direction_input = ad7879_gpio_direction_input;
+		ts->gc.direction_output = ad7879_gpio_direction_output;
+		ts->gc.get = ad7879_gpio_get_value;
+		ts->gc.set = ad7879_gpio_set_value;
+		ts->gc.can_sleep = 1;
+		ts->gc.base = pdata->gpio_base;
+		ts->gc.ngpio = 1;
+		ts->gc.label = "AD7879-GPIO";
+		ts->gc.owner = THIS_MODULE;
+		ts->gc.dev = ts->dev;
+
+		ret = gpiochip_add(&ts->gc);
+		if (ret)
+			dev_err(ts->dev, "failed to register gpio %d\n",
+				ts->gc.base);
+	}
+
+	return ret;
+}
+
+static void ad7879_gpio_remove(struct ad7879 *ts)
+{
+	const struct ad7879_platform_data *pdata = dev_get_platdata(ts->dev);
+
+	if (pdata->gpio_export)
+		gpiochip_remove(&ts->gc);
+
+}
+#else
+static inline int ad7879_gpio_add(struct ad7879 *ts,
+				  const struct ad7879_platform_data *pdata)
+{
+	return 0;
+}
+
+static inline void ad7879_gpio_remove(struct ad7879 *ts)
+{
+}
+#endif
+
+struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
+			    const struct ad7879_bus_ops *bops)
+{
+	struct ad7879_platform_data *pdata = dev_get_platdata(dev);
+	struct ad7879 *ts;
+	struct input_dev *input_dev;
+	int err;
+	u16 revid;
+
+	if (!irq) {
+		dev_err(dev, "no IRQ?\n");
+		err = -EINVAL;
+		goto err_out;
+	}
+
+	if (!pdata) {
+		dev_err(dev, "no platform data?\n");
+		err = -EINVAL;
+		goto err_out;
+	}
+
+	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
+	input_dev = input_allocate_device();
+	if (!ts || !input_dev) {
+		err = -ENOMEM;
+		goto err_free_mem;
+	}
+
+	ts->bops = bops;
+	ts->dev = dev;
+	ts->input = input_dev;
+	ts->irq = irq;
+	ts->swap_xy = pdata->swap_xy;
+
+	setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
+
+	ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
+	ts->pressure_max = pdata->pressure_max ? : ~0;
+
+	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;
+	ts->median = pdata->median;
+
+	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
+
+	input_dev->name = "AD7879 Touchscreen";
+	input_dev->phys = ts->phys;
+	input_dev->dev.parent = dev;
+	input_dev->id.bustype = bops->bustype;
+
+	input_dev->open = ad7879_open;
+	input_dev->close = ad7879_close;
+
+	input_set_drvdata(input_dev, ts);
+
+	__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);
+
+	__set_bit(EV_KEY, input_dev->evbit);
+	__set_bit(BTN_TOUCH, input_dev->keybit);
+
+	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);
+
+	err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
+	if (err < 0) {
+		dev_err(dev, "Failed to write %s\n", input_dev->name);
+		goto err_free_mem;
+	}
+
+	revid = ad7879_read(ts, AD7879_REG_REVID);
+	input_dev->id.product = (revid & 0xff);
+	input_dev->id.version = revid >> 8;
+	if (input_dev->id.product != devid) {
+		dev_err(dev, "Failed to probe %s (%x vs %x)\n",
+			input_dev->name, devid, revid);
+		err = -ENODEV;
+		goto err_free_mem;
+	}
+
+	ts->cmd_crtl3 = AD7879_YPLUS_BIT |
+			AD7879_XPLUS_BIT |
+			AD7879_Z2_BIT |
+			AD7879_Z1_BIT |
+			AD7879_TEMPMASK_BIT |
+			AD7879_AUXVBATMASK_BIT |
+			AD7879_GPIOALERTMASK_BIT;
+
+	ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR |
+			AD7879_AVG(ts->averaging) |
+			AD7879_MFS(ts->median) |
+			AD7879_FCD(ts->first_conversion_delay);
+
+	ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 |
+			AD7879_ACQ(ts->acquisition_time) |
+			AD7879_TMR(ts->pen_down_acc_interval);
+
+	err = request_threaded_irq(ts->irq, NULL, ad7879_irq,
+				   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				   dev_name(dev), ts);
+	if (err) {
+		dev_err(dev, "irq %d busy?\n", ts->irq);
+		goto err_free_mem;
+	}
+
+	__ad7879_disable(ts);
+
+	err = sysfs_create_group(&dev->kobj, &ad7879_attr_group);
+	if (err)
+		goto err_free_irq;
+
+	err = ad7879_gpio_add(ts, pdata);
+	if (err)
+		goto err_remove_attr;
+
+	err = input_register_device(input_dev);
+	if (err)
+		goto err_remove_gpio;
+
+	return ts;
+
+err_remove_gpio:
+	ad7879_gpio_remove(ts);
+err_remove_attr:
+	sysfs_remove_group(&dev->kobj, &ad7879_attr_group);
+err_free_irq:
+	free_irq(ts->irq, ts);
+err_free_mem:
+	input_free_device(input_dev);
+	kfree(ts);
+err_out:
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(ad7879_probe);
+
+void ad7879_remove(struct ad7879 *ts)
+{
+	ad7879_gpio_remove(ts);
+	sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group);
+	free_irq(ts->irq, ts);
+	input_unregister_device(ts->input);
+	kfree(ts);
+}
+EXPORT_SYMBOL(ad7879_remove);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
+MODULE_LICENSE("GPL");